Compilare: user.cpp: In function ‘int main()’: user.cpp:74:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<m.size();++j) ^ user.cpp:86:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<sol.size();j++) ^ user.cpp:52:11: warning: variable ‘k’ set but not used [-Wunused-but-set-variable] int n,k,i,j; ^ user.cpp:50:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("desen.in","r",stdin); ^ user.cpp:51:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("desen.out","w",stdout); ^ user.cpp:54:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:58:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&a[i].x,&a[i].y); ^