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day03.c
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#include<stdio.h>
char sample[323][31] = {".........#..##.##..............",
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".##............#.........#....#",
".#...##.###..#........##.#..#..",
"..#........#.#.....##..##.#....",
"...........#...........#.....#.",
".#...######..##...#.....#......",
".#.##.#.......#......#......#..",
".#.....#.....#........#........",
"...#..#...#.##...#...........#.",
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"#............#........##.......",
".#.#...#.............#..##.....",
".#....#..#.#......#.##.......##",
"...................##...##..###",
"..#.....#...#................#.",
"..#...#....#...#.#.#...#.....#.",
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"#.....#..#.....#..#...#.......#",
"..#.#...#....#....##..#...##...",
".##..#..#..##....##...#........"};
char test[11][11] ={"..##.......",
"#...#...#..",
".#....#..#.",
"..#.#...#.#",
".#...##..#.",
"..#.##.....",
".#.#.#....#",
".#........#",
"#.##...#...",
"#...##....#",
".#..#...#.#"};
int n_trees(char *data, int rows, int column, int right_move, int down_move)
{
int trees = 0;
int right = 0;
for(size_t i=down_move; i<rows; i= i + down_move) {
right += right_move;
//char *temp_row_ptr = (sample + i*rows) ;
//char *temp_column_ptr =
char temp = *((data + i*column) + right % column);
if( temp == '#') {trees++;}
}
printf ("trees %u, right = %u down = %u\n", trees, right_move,down_move);
return trees;
}
int main(void)
{
printf("product %u\n", n_trees((char*)test, 11,11,1,1)*n_trees((char*)test, 11,11,3,1)*n_trees((char*)test, 11,11,5,1)*n_trees((char*)test, 11,11,7,1)*n_trees((char*)test, 11,11,1,2));
printf("product %u\n", n_trees((char*)sample, 323,31,1,1)*n_trees((char*)sample, 323,31,3,1)*n_trees((char*)sample, 323,31,5,1)*n_trees((char*)sample, 323,31,7,1)*n_trees((char*)sample, 323,31,1,2));
//3093068400
return 0;
}