Compilare: user.cpp: In function ‘bool go(int, int, int)’: user.cpp:50:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int u=0;u<hsh[line].size();++u) ^ user.cpp: In function ‘int main()’: user.cpp:60:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("radio2.in","r",stdin); ^ user.cpp:61:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("radio2.out","w",stdout); ^ user.cpp:63:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%s",&N,&M,&L,&K,str); ^ user.cpp:102:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",we); ^