Compilare: user.cpp: In function ‘void impa(int, int)’: user.cpp:20:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int a=0;a<na.size();a++) ^ user.cpp: In function ‘void impb(int, int)’: user.cpp:33:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int a=0;a<nb.size();a++) ^ user.cpp: In function ‘int main()’: user.cpp:45:7: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] if(x==0&sa.size()==0) ^ user.cpp:67:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int a=0;a<sa.size();a++) ^ user.cpp:70:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int a=0;a<sb.size();a++) ^ user.cpp:39:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("numar4.in","r",stdin); ^ user.cpp:40:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("numar4.out","w",stdout); ^ user.cpp:41:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&j); ^ user.cpp:42:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&j); ^