Compilare: user.cpp: In function ‘int main()’: user.cpp:103:11: warning: unused variable ‘j’ [-Wunused-variable] int i, j, t, cnt, a, b, c, d; ^ user.cpp:103:14: warning: unused variable ‘t’ [-Wunused-variable] int i, j, t, cnt, a, b, c, d; ^ user.cpp:100:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("namlei.in", "r", stdin); ^ user.cpp:101:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("namlei.out", "w", stdout); ^ user.cpp:106:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &n, &k, &X, &Y); ^ user.cpp:108:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &cnt, &a, &b); ^