Compilare: user.cpp: In function ‘void Search(int)’: user.cpp:21:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < h[r].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:29:25: warning: variable ‘nr’ set but not used [-Wunused-but-set-variable] int i,j,k,a,b,c,d,e,nr; ^ user.cpp:26:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("eqs.in","r",stdin); ^ user.cpp:27:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("eqs.out","w",stdout); ^ user.cpp:35:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d %d",&a,&b,&c,&d,&e); ^