Compilare: user.cpp: In function ‘int ok(int)’: user.cpp:91:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0;k<hsh[lin].size();k++) ^ user.cpp:121:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k==hsh[lin].size()) hsh[lin].push_back(make_pair(cod[i][j],1)); ^ user.cpp: In function ‘int main()’: user.cpp:134:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("poze.in","r",stdin); ^ user.cpp:135:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("poze.out","w",stdout); ^ user.cpp:136:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&T); ^ user.cpp:146:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&K); ^ user.cpp:149:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][j]); ^