Compilare: user.cpp: In function ‘int main()’: user.cpp:41:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[i].size()==r) ^ user.cpp:53:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[i].size()==r && !cup[i]) ok|=cupleaza(i); ^ user.cpp:56:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[i].size()==r && !cup[i]) ^ user.cpp:62:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[i].size()==r) ^ user.cpp:69:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol.size();i++) ^ user.cpp:30:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ar.in", "r", stdin); ^ user.cpp:31:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ar.out", "w", stdout); ^ user.cpp:33:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&r); ^ user.cpp:36:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^