Compilare: user.cpp: In function ‘void print()’: user.cpp:52:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<vc.size() &&i<vl.size();i++) ^ user.cpp:52:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<vc.size() &&i<vl.size();i++) ^ user.cpp:55:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<vc.size();i++) ^ user.cpp:58:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<vl.size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:63:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("becuri.in","r",stdin); ^ user.cpp:64:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("becuri.out","w",stdout); ^ user.cpp:67:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d",&n,&m); ^ user.cpp:70:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d",&a[i][j]); ^