Compilare: user.cpp: In function ‘void del(int)’: user.cpp:19:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(it->first == val) { ^ user.cpp: In function ‘void ins(int)’: user.cpp:29:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(it->first == val) { ^ user.cpp: In function ‘int main()’: user.cpp:62:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv5.in", "r", stdin); ^ user.cpp:63:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv5.out", "w", stdout); ^ user.cpp:66:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &l, &u); ^ user.cpp:68:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%u", &x[i]); ^