Compilare: user.cpp: In function ‘int cop(int, int, int)’: user.cpp:20:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<margini[x].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:79:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<marg.size()-1;i++) ^ user.cpp:82:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<marg.size()-1;i++) ^ user.cpp:33:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.in","r",stdin); ^ user.cpp:36:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp:40:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&x.x,&x.y,&x.c); ^