Compilare: user.cpp: In function ‘int main()’: user.cpp:90:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<over.size();i++) ^ user.cpp:91:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<under.size();j++){ ^ user.cpp:100:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<under.size();i++){ ^ user.cpp:61:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("monede.in","r",stdin); ^ user.cpp:62:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("monede.out","w",stdout); ^ user.cpp:64:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp:67:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][j]); ^