Compilare: user.cpp: In function ‘int main()’: user.cpp:30:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp:33:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i;j<v[x].size()-1;j++) ^ user.cpp:11:9: warning: unused variable ‘poz’ [-Wunused-variable] int x,y,poz,maxim=0; ^ user.cpp:11:13: warning: unused variable ‘maxim’ [-Wunused-variable] int x,y,poz,maxim=0; ^ user.cpp:8:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ciclueuler.in","r",stdin); ^ user.cpp:9:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ciclueuler.out","w",stdout); ^ user.cpp:10:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:14:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^