Compilare: main.cpp: In function 'int main()': main.cpp:43:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v.size()-2 ; i++) ~~^~~~~~~~~~~~ main.cpp:44:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i+1 ; j < v.size()-1 ; j++) ~~^~~~~~~~~~~~ main.cpp:45:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = j+1 ; k < v.size() ; k++) ~~^~~~~~~~~~ main.cpp:25:45: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("colorfulconflict.in","r",stdin); ^ main.cpp:26:47: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("colorfulconflict.out","w",stdout); ^ main.cpp:27:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:32:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][j]); ^