Compilare: main.cpp: In function 'void myfill(int, int)': main.cpp:22:12: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if (xn >= 0 && xn < n && yn >= 0 && yn < m) ^ main.cpp: In function 'int main()': main.cpp:58:28: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'char (*)[1001]' [-Wformat=] scanf ("%s", &H [i]); ^ main.cpp:53:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("pirati.in", "r", stdin); ^ main.cpp:54:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("pirati.out", "w", stdout); ^ main.cpp:56:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d%d\n", &n, &m, &q); ^ main.cpp:58:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%s", &H [i]); ^ main.cpp:70:47: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d%d%d", &xs, &ys, &xf, &yf); ^ main.cpp: In function 'void myfill(int, int)': main.cpp:20:23: warning: iteration 7 invokes undefined behavior [-Waggressive-loop-optimizations] xn = x + dx [k]; ~~~~~^ main.cpp:19:19: note: within this loop for (k = 0; k < 8; k ++) { ~~^~~