Compilare: user.cpp: In function ‘int main()’: user.cpp:75:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<m.size();++j) ^ user.cpp:87:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<sol.size();j++) ^ user.cpp:53:11: warning: variable ‘k’ set but not used [-Wunused-but-set-variable] int n,k,i,j; ^ user.cpp:51:34: 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:52:36: 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:55:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:59:39: 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); ^