Compilare: main.cpp: In function 'int main()': main.cpp:28:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < v.size() && !ok ; j ++) ~~^~~~~~~~~~ main.cpp:43:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < v.size() && ok ; i ++) ~~^~~~~~~~~~ main.cpp:46:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < v[i].size() ; j ++) ~~^~~~~~~~~~~~~ main.cpp:51:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < v[0].length() && ok ; j ++) ~~^~~~~~~~~~~~~~~ main.cpp:14:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("polihroniade.in", "r", stdin); ^ main.cpp:15:45: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("polihroniade.out", "w", stdout); ^ main.cpp:17:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &p, &tst); ^ main.cpp:20:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &n); ^