Compilare: main.cpp: In function 'int main()': main.cpp:91:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < lin[0].size(); ++i) ~~^~~~~~~~~~~~~~~ main.cpp:93:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < col[0].size(); ++i) ~~^~~~~~~~~~~~~~~ main.cpp:71:43: 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:72:45: 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:73:38: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%hd%hd", &CERINTA, &TESTS); ^ main.cpp:76:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:80:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf(" %c", &x); ^