Compilare: user.cpp: In function ‘void binarysearch(int*)’: user.cpp:136:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (t=0;t<x[mid].s.size();t++) ^ user.cpp: In function ‘int main()’: user.cpp:174:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("colectie.in","r",stdin); ^ user.cpp:175:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("colectie.out","w",stdout); ^ user.cpp:177:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&k); ^ user.cpp:180:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i][j]); ^