Compilare: user.cpp: In function ‘void insert(int, int)’: user.cpp:17:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<h[ind].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:42:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<h[i].size();++j) ^ user.cpp:55:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<h[i].size();++j) ^ user.cpp:25:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("patrate6.in","r",stdin); ^ user.cpp:26:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("patrate6.out","w",stdout); ^ user.cpp:28:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:31:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^