Compilare: user.cpp: In function ‘int main()’: user.cpp:77:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<buc[i-1].size();++j) ^ user.cpp:59:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rangemode.in","r",stdin); ^ user.cpp:60:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rangemode.out","w",stdout); ^