Compilare: main.cpp: In function 'int main()': main.cpp:58:34: 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:59:36: 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:60:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d\n", &m, &n, &k); ^ main.cpp:62:31: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(S[i] + 1, NMAX, stdin); ^ main.cpp:73:40: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &x1, &y1, &x2, &y2); ^ main.cpp: In function 'void fill2(int, int)': main.cpp:19:13: warning: iteration 7 invokes undefined behavior [-Waggressive-loop-optimizations] if(x+lin[t] && x + lin[t]<= m && y+col[t] && y+col[t]<=n && S[x+lin[t]][y+col[t]] =='0') ~~~~~^ main.cpp:18:19: note: within this loop for(int t = 0; t < 8; ++t) ~~^~~ main.cpp: In function 'void fill(int, int)': main.cpp:26:15: warning: iteration 7 invokes undefined behavior [-Waggressive-loop-optimizations] if(S[x+lin[t]][y+col[t]]=='1') ~~~~~^ main.cpp:25:19: note: within this loop for(int t = 0; t < 8; ++t){ ~~^~~