Compilare: user.cpp: In function ‘int main()’: user.cpp:52:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(ok == 0) ^ user.cpp:88:25: warning: unused variable ‘A’ [-Wunused-variable] int A = it->x; ^ user.cpp:91:25: warning: unused variable ‘C’ [-Wunused-variable] int C = it->x; ^ user.cpp:14:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("combl.in", "r", stdin); ^ user.cpp:15:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("combl.out", "w", stdout); ^ user.cpp:16:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:18:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &a, &b, &c); ^