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Day 4

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master
Jonathan Hodgson 2 years ago
parent 500a3d3db1
commit 89a87bf95b
6 changed files with 1049 additions and 0 deletions
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  1. 10
      day4/Makefile
  2. 19
      day4/example.txt
  3. 60
      day4/instructions.txt
  4. 601
      day4/realinput.txt
  5. 174
      day4/solution-part1.c
  6. 185
      day4/solution-part2.c

10
day4/Makefile
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solution-part%: solution-part%.c
gcc $< -o $@
test-%: solution-% example.txt
$< example.txt
run-%: solution-% realinput.txt
$< realinput.txt
.PHONY: $(patsubst %,run-%, 1 2) $(patsubst %,test-%, 1 2)

19
day4/example.txt
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7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
22 13 17 11 0
8 2 23 4 24
21 9 14 16 7
6 10 3 18 5
1 12 20 15 19
3 15 0 2 22
9 18 13 17 5
19 8 7 25 23
20 11 10 24 4
14 21 16 12 6
14 21 17 24 4
10 16 15 9 19
18 8 23 26 20
22 11 13 6 5
2 0 12 3 7

60
day4/instructions.txt
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--- Day 4: Giant Squid ---
You're already almost 1.5km (almost a mile) below the surface of the ocean, already so deep that you can't see any sunlight. What you can see, however, is a giant squid that has attached itself to the outside of your submarine.
Maybe it wants to play bingo?
Bingo is played on a set of boards each consisting of a 5x5 grid of numbers. Numbers are chosen at random, and the chosen number is marked on all boards on which it appears. (Numbers may not appear on all boards.) If all numbers in any row or any column of a board are marked, that board wins. (Diagonals don't count.)
The submarine has a bingo subsystem to help passengers (currently, you and the giant squid) pass the time. It automatically generates a random order in which to draw numbers and a random set of boards (your puzzle input). For example:
7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
22 13 17 11 0
8 2 23 4 24
21 9 14 16 7
6 10 3 18 5
1 12 20 15 19
3 15 0 2 22
9 18 13 17 5
19 8 7 25 23
20 11 10 24 4
14 21 16 12 6
14 21 17 24 4
10 16 15 9 19
18 8 23 26 20
22 11 13 6 5
2 0 12 3 7
After the first five numbers are drawn (7, 4, 9, 5, and 11), there are no winners, but the boards are marked as follows (shown here adjacent to each other to save space):
22 13 17 11 0 3 15 0 2 22 14 21 17 24 4
8 2 23 4 24 9 18 13 17 5 10 16 15 9 19
21 9 14 16 7 19 8 7 25 23 18 8 23 26 20
6 10 3 18 5 20 11 10 24 4 22 11 13 6 5
1 12 20 15 19 14 21 16 12 6 2 0 12 3 7
After the next six numbers are drawn (17, 23, 2, 0, 14, and 21), there are still no winners:
22 13 17 11 0 3 15 0 2 22 14 21 17 24 4
8 2 23 4 24 9 18 13 17 5 10 16 15 9 19
21 9 14 16 7 19 8 7 25 23 18 8 23 26 20
6 10 3 18 5 20 11 10 24 4 22 11 13 6 5
1 12 20 15 19 14 21 16 12 6 2 0 12 3 7
Finally, 24 is drawn:
22 13 17 11 0 3 15 0 2 22 14 21 17 24 4
8 2 23 4 24 9 18 13 17 5 10 16 15 9 19
21 9 14 16 7 19 8 7 25 23 18 8 23 26 20
6 10 3 18 5 20 11 10 24 4 22 11 13 6 5
1 12 20 15 19 14 21 16 12 6 2 0 12 3 7
At this point, the third board wins because it has at least one complete row or column of marked numbers (in this case, the entire top row is marked: 14 21 17 24 4).
The score of the winning board can now be calculated. Start by finding the sum of all unmarked numbers on that board; in this case, the sum is 188. Then, multiply that sum by the number that was just called when the board won, 24, to get the final score, 188 * 24 = 4512.
To guarantee victory against the giant squid, figure out which board will win first. What will your final score be if you choose that board?

601
day4/realinput.txt
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6,69,28,50,36,84,49,13,48,90,1,33,71,0,94,59,53,58,60,96,30,34,29,91,11,41,77,95,17,80,85,93,7,9,74,89,18,25,26,8,87,38,68,5,12,43,27,46,62,73,16,55,22,4,65,76,54,52,83,10,21,67,15,47,45,40,35,66,79,51,75,39,64,24,37,72,3,44,82,32,78,63,57,2,86,31,19,92,14,97,20,56,88,81,70,61,42,99,23,98
22 59 7 10 6
33 36 96 55 23
13 85 18 29 28
75 46 83 73 58
34 40 87 56 98
73 96 47 14 10
28 11 79 84 20
74 30 0 59 71
80 93 42 22 17
44 2 81 29 15
73 32 37 93 39
2 87 38 99 97
15 12 42 49 33
9 23 25 94 19
57 4 18 70 79
43 79 59 71 78
51 97 37 28 26
46 21 84 8 86
96 30 17 34 49
55 90 99 75 61
43 86 35 51 24
16 25 29 21 3
2 13 4 36 54
89 27 8 85 34
96 59 65 14 56
5 57 43 4 1
86 80 67 30 20
22 16 99 0 14
40 25 59 91 54
82 95 96 37 24
97 20 87 66 21
25 40 9 78 89
52 75 95 63 62
32 43 13 47 69
53 48 56 29 4
24 4 65 12 8
76 3 81 99 49
45 33 31 66 34
17 94 75 35 88
64 10 7 93 95
88 20 99 15 83
81 40 5 6 98
49 74 18 27 9
43 69 28 37 71
87 82 90 14 47
21 97 92 42 60
11 65 98 95 29
2 49 75 20 74
56 40 78 66 81
68 4 46 77 61
26 14 39 76 11
41 74 34 91 4
51 9 97 29 75
83 86 23 35 77
90 2 49 30 89
34 97 0 22 15
65 60 82 66 47
30 9 49 95 48
54 73 67 17 78
33 96 44 1 32
90 29 10 49 63
8 26 95 61 0
54 13 51 12 44
32 48 16 47 84
55 46 93 14 3
68 55 46 16 54
97 59 49 6 21
52 32 15 96 70
57 56 61 51 0
40 31 62 24 48
75 56 70 42 14
77 9 23 62 25
29 27 54 17 2
55 72 43 15 96
45 30 88 86 1
65 12 22 6 51
77 81 15 91 19
80 71 27 89 52
75 92 41 83 57
40 44 66 84 98
89 80 73 59 18
74 55 67 71 10
78 27 37 57 3
92 26 17 5 72
52 83 28 76 51
64 0 87 4 13
14 43 42 62 31
17 84 72 91 83
53 80 59 61 74
47 22 38 28 77
65 49 91 94 19
25 81 64 57 9
50 95 82 12 66
53 54 85 36 11
31 56 83 18 60
6 12 76 37 33
14 96 16 31 40
17 82 27 94 83
1 50 49 9 54
29 70 59 91 77
85 0 33 41 16
7 86 80 53 65
94 19 28 35 32
4 55 93 97 63
83 22 67 56 36
28 70 65 17 19
88 51 15 73 12
11 49 80 23 42
26 54 90 75 29
74 77 91 86 66
88 22 83 10 43
57 34 15 23 8
94 42 68 67 37
84 3 6 71 62
89 45 72 55 38
68 27 93 7 15
85 96 1 56 6
32 2 30 55 17
99 90 37 80 50
77 78 58 98 57
5 95 22 13 97
19 2 52 92 20
75 49 86 31 41
51 63 56 33 10
82 27 79 94 57
15 44 91 26 4
41 78 53 95 86
90 92 46 56 33
80 93 68 66 70
36 10 38 0 6
11 47 52 64 17
16 60 39 55 78
46 18 33 83 35
13 92 4 23 50
40 5 29 6 90
20 60 2 23 74
43 39 91 75 12
58 67 50 29 79
10 40 92 95 25
13 24 53 72 36
69 64 15 53 86
61 11 48 71 27
26 93 38 70 73
96 29 30 98 45
13 7 31 59 84
13 55 50 54 57
32 24 45 5 77
82 86 0 4 99
75 72 14 40 56
76 94 89 17 30
66 71 86 41 0
80 64 3 29 78
23 21 42 99 87
96 60 75 61 49
2 83 85 12 1
78 96 4 82 6
73 36 57 99 8
11 83 15 35 30
85 87 25 22 66
32 64 16 50 43
6 39 55 2 4
1 61 99 71 80
46 88 22 31 60
62 66 37 97 76
74 34 10 52 24
42 38 13 65 12
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81 99 1 69 40
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91 78 72 30 73
43 68 82 72 2
34 92 33 97 89
63 70 9 0 45
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40 20 55 57 49
41 22 8 16 49
71 64 19 65 92
17 10 26 36 29
30 88 7 54 11
77 55 70 72 47
15 94 90 6 39
99 55 16 54 91
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25 34 83 14 12
30 2 77 27 66
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87 42 56 92 28
49 82 52 17 78
54 89 63 77 27
83 14 24 16 84
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68 44 43 3 54
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80 38 71 6 75
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27 89 39 85 28
3 81 93 64 74
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53 4 24 50 45
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98 85 27 84 42
90 15 17 61 34
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59 47 53 5 35
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63 36 51 30 92
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67 52 40 16 33
2 55 0 71 46
21 75 59 66 83
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68 73 74 83 70
56 15 12 78 4
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64 11 68 33 27
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10 24 15 3 46
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34 41 25 30 48
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74 13 39 84 83
72 88 56 53 97
31 92 91 84 71
54 90 89 80 0
98 96 65 66 68
35 39 70 11 82
15 34 42 52 2
68 71 86 82 37
28 48 12 34 54
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60 4 50 21 22
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94 56 19 15 8
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35 28 25 72 30
43 85 69 92 26
61 75 5 73 66
16 87 4 99 48
18 19 79 23 83
37 88 31 38 40
23 10 89 84 76
45 39 62 55 66
25 73 79 43 60
12 69 36 93 71
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99 15 30 50 16
14 95 12 25 33
54 40 58 46 66
5 23 39 29 48
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59 99 80 97 66
45 51 88 47 82
35 27 72 85 16
54 58 2 1 52
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89 85 39 99 98
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72 43 76 58 33
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74 70 15 80 72
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75 86 74 89 18
30 42 4 19 92
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81 36 24 4 76
0 71 66 41 57
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58 74 50 47 84
2 1 62 36 60
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15 94 88 52 19
80 83 23 61 4
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92 38 65 42 76
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30 49 56 69 59
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73 10 29 0 48
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79 55 53 51 5
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82 83 32 74 30
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66 10 63 62 8
36 5 47 39 67
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37 92 69 56 52
46 66 20 78 13
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81 84 23 0 76
95 84 71 92 52
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0 76 32 45 83
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81 96 63 4 61
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3 38 11 14 35
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53 39 46 71 1
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81 97 68 46 75
62 73 63 36 41
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25 26 3 88 56
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44 58 84 91 38
39 46 57 98 50
96 42 73 24 70
71 32 53 48 13
98 72 25 96 77
80 64 88 53 23
21 37 45 24 18
41 86 59 68 5
76 50 36 26 12
77 79 88 74 12
21 9 85 26 68
11 62 64 4 5
47 33 76 63 87
55 19 2 60 95
74 79 30 14 35
90 52 17 29 63
18 69 78 34 26
92 42 85 71 56
12 2 5 0 98

174
day4/solution-part1.c
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#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#define ANSI_COLOR_RED "\x1b[31m"
#define ANSI_COLOR_RESET "\x1b[0m"
typedef struct {
unsigned int value;
bool marked;
} Cell;
typedef struct {
Cell cells[5][5];
} Grid;
unsigned int getEmptyLines(FILE *fp){
char line[500];
unsigned int emptyLines = 0;
while (!feof (fp)){
fgets(line, 500, fp);
//Length of 1 because it's a new line character only
if ( strlen(line) == 1 ) emptyLines ++;
}
return emptyLines;
}
//fp should be pointing to the start of the file as rounds are the first line
unsigned int countRounds(FILE *fp){
unsigned int rounds=0;
char ch = fgetc(fp);
while ( ch != EOF ){
switch (ch){
case ',':
rounds++;
break;
case '\n':
rounds++;
return rounds;
break;
}
ch = fgetc(fp);
}
return rounds;
}
void printGrid(Grid *grid){
for ( unsigned int row = 0; row < 5; row++ ){
for ( unsigned int col = 0; col < 5; col++ ){
if ( grid->cells[row][col].marked ) printf(ANSI_COLOR_RED);
printf("%3i", grid->cells[row][col].value);
if ( grid->cells[row][col].marked ) printf(ANSI_COLOR_RESET);
}
printf("\n");
}
}
void printAllGrids(Grid grids[], unsigned int no){
for( unsigned int i = 0; i<no; i++ ){
printf("Grid %i\n", i);
printGrid(&grids[i]);
printf("\n");
}
}
unsigned int sumUnmarked(Grid *grid){
unsigned int sum = 0;
for ( unsigned int row = 0; row < 5; row++ ){
for ( unsigned int col = 0; col < 5; col++ ){
if ( !grid->cells[row][col].marked ) sum += grid->cells[row][col].value;
}
}
return sum;
}
int main( int argc, char *argv[] ){
if( argc == 2 ) {
FILE *fp=fopen(argv[1], "r");
//The number of empty linse is the same as the number of grids
unsigned int gridCount = getEmptyLines(fp);
rewind(fp);
Grid grids[gridCount];
unsigned int rounds = countRounds(fp);
int draws[rounds];
memset( &draws, 0, rounds*sizeof(int) );
rewind(fp);
char ch;
for ( unsigned int i = 0; i < rounds; i++ ){
fscanf(fp, "%i%c,", &draws[i], &ch);
}
// Put all the numbers into the grid array
unsigned int no;
unsigned int grid = 0, row = 0, col = 0;
while ( !feof(fp) && fscanf(fp, "%i", &no) ){
grids[grid].cells[row][col].value = no;
grids[grid].cells[row][col].marked = false;
col = (col + 1) % 5;
if ( col == 0 ) row = (row + 1) % 5;
if ( col == 0 && row == 0 ) grid++;
}
//Start playing the game
bool bingo=false;
for (unsigned int round = 0; round < rounds && !bingo; round++){
for( unsigned int grid = 0; grid < gridCount && !bingo; grid++ ){
for( unsigned int row = 0; row < 5 && !bingo; row++ ){
for( unsigned int col = 0; col < 5 && !bingo; col++ ){
if ( grids[grid].cells[row][col].value == draws[round] ){
grids[grid].cells[row][col].marked = true;
//If we are above round 4, it's possible to have won
if ( round > 4 ){
bool maybebingorow=true;
bool maybebingocol=true;
// As soon as neither row or column is bingo, stop cheking
for (unsigned int i = 0; ( maybebingocol || maybebingorow ) && i < 5; i++){
// Go through the row and column for the matched number
// As soon as we find one in the row or column that isn't marked, we know that won't be bingo
if ( !grids[grid].cells[row][i].marked ) maybebingorow = false;
if ( !grids[grid].cells[i][col].marked ) maybebingocol = false;
}
//If we get here and maybebingocol or maybebingorow is true, we have bingo
if ( maybebingorow || maybebingocol ){
bingo=true;
unsigned int sum = sumUnmarked( &grids[grid] );
printf("Bingo!!\n");
printf("Round: %i\n", round);
printf("Grid: %i\n", grid);
printf("Unmarked Sum: %i\n", sum);
printf("Last Called: %i\n", draws[round]);
printf("Answer: %i\n", sum * draws[round]);
printf("\n");
printGrid(&grids[grid]);
}
}
}
}
}
}
//No point checking before round 5
}
fclose(fp);
return 0;
} else {
printf("You need to provide a file\n");
return 1;
}
}

185
day4/solution-part2.c
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#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#define ANSI_COLOR_RED "\x1b[31m"
#define ANSI_COLOR_RESET "\x1b[0m"
typedef struct {
unsigned int value;
bool marked;
} Cell;
typedef struct {
Cell cells[5][5];
} Grid;
unsigned int getEmptyLines(FILE *fp){
char line[500];
unsigned int emptyLines = 0;
while (!feof (fp)){
fgets(line, 500, fp);
//Length of 1 because it's a new line character only
if ( strlen(line) == 1 ) emptyLines ++;
}
return emptyLines;
}
//fp should be pointing to the start of the file as rounds are the first line
unsigned int countRounds(FILE *fp){
unsigned int rounds=0;
char ch = fgetc(fp);
while ( ch != EOF ){
switch (ch){
case ',':
rounds++;
break;
case '\n':
rounds++;
return rounds;
break;
}
ch = fgetc(fp);
}
return rounds;
}
void printGrid(Grid *grid){
for ( unsigned int row = 0; row < 5; row++ ){
for ( unsigned int col = 0; col < 5; col++ ){
if ( grid->cells[row][col].marked ) printf(ANSI_COLOR_RED);
printf("%3i", grid->cells[row][col].value);
if ( grid->cells[row][col].marked ) printf(ANSI_COLOR_RESET);
}
printf("\n");
}
}
void printAllGrids(Grid grids[], unsigned int no){
for( unsigned int i = 0; i<no; i++ ){
printf("Grid %i\n", i);
printGrid(&grids[i]);
printf("\n");
}
}
unsigned int sumUnmarked(Grid *grid){
unsigned int sum = 0;
for ( unsigned int row = 0; row < 5; row++ ){
for ( unsigned int col = 0; col < 5; col++ ){
if ( !grid->cells[row][col].marked ) sum += grid->cells[row][col].value;
}
}
return sum;
}
unsigned int countWon( bool *wonGrids, unsigned int gridCount ){
unsigned int won = 0;
for( unsigned int i = 0; i < gridCount; i++ ) if( wonGrids[i] ) won++;
return won;
}
int main( int argc, char *argv[] ){
if( argc == 2 ) {
FILE *fp=fopen(argv[1], "r");
//The number of empty linse is the same as the number of grids
unsigned int gridCount = getEmptyLines(fp);
rewind(fp);
Grid grids[gridCount];
bool wonGrids[gridCount];
memset( &wonGrids, 0, gridCount*sizeof(bool) );
unsigned int rounds = countRounds(fp);
int draws[rounds];
memset( &draws, 0, rounds*sizeof(int) );
rewind(fp);
char ch;
for ( unsigned int i = 0; i < rounds; i++ ){
fscanf(fp, "%i%c,", &draws[i], &ch);
}
// Put all the numbers into the grid array
unsigned int no;
unsigned int grid = 0, row = 0, col = 0;
while ( !feof(fp) && fscanf(fp, "%i", &no) ){
grids[grid].cells[row][col].value = no;
grids[grid].cells[row][col].marked = false;
col = (col + 1) % 5;
if ( col == 0 ) row = (row + 1) % 5;
if ( col == 0 && row == 0 ) grid++;
}
//Start playing the game
bool allwon=false;
for (unsigned int round = 0; round < rounds; round++){
for( unsigned int grid = 0; grid < gridCount; grid++ ){
for( unsigned int row = 0; row < 5; row++ ){
for( unsigned int col = 0; col < 5; col++ ){
if ( grids[grid].cells[row][col].value == draws[round] ){
grids[grid].cells[row][col].marked = true;
//If we are above round 4, it's possible to have won
if ( round > 4 ){
bool maybebingorow=true;
bool maybebingocol=true;
// As soon as neither row or column is bingo, stop cheking
for (unsigned int i = 0; ( maybebingocol || maybebingorow ) && i < 5; i++){
// Go through the row and column for the matched number
// As soon as we find one in the row or column that isn't marked, we know that won't be bingo
if ( !grids[grid].cells[row][i].marked ) maybebingorow = false;
if ( !grids[grid].cells[i][col].marked ) maybebingocol = false;
}
//If we get here and maybebingocol or maybebingorow is true, we have bingo
if ( maybebingorow || maybebingocol ){
wonGrids[grid] = true;
if ( countWon(wonGrids, gridCount) == gridCount ){
unsigned int sum = sumUnmarked( &grids[grid] );
printf("Last Bingo!!\n");
printf("Round: %i\n", round);
printf("Grid: %i\n", grid);
printf("Unmarked Sum: %i\n", sum);
printf("Last Called: %i\n", draws[round]);
printf("Answer: %i\n", sum * draws[round]);
printf("\n");
printGrid(&grids[grid]);
return 0;
}
}
}
}
}
}
}
//No point checking before round 5
}
fclose(fp);
return 0;
} else {
printf("You need to provide a file\n");
return 1;
}
}
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