Compilare: user.cpp: In function ‘int main()’: user.cpp:40:15: warning: unused variable ‘j’ [-Wunused-variable] int n, i, j, m, e, x, y, ans = 0; ^ user.cpp:41:10: warning: unused variable ‘flag’ [-Wunused-variable] bool flag; ^ user.cpp:43:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("cuplaj.in", "r", stdin); ^ user.cpp:44:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("cuplaj.out", "w", stdout); ^ user.cpp:46:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d%d", &n, &m, &e); ^ user.cpp:48:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &x, &y); ^