Compilare: user.cpp: In function ‘int main()’: user.cpp:15:18: warning: unused variable ‘j’ [-Wunused-variable] int n, m, i, j, s, t, d, k, vf; ^ user.cpp:15:21: warning: unused variable ‘s’ [-Wunused-variable] int n, m, i, j, s, t, d, k, vf; ^ user.cpp:15:24: warning: unused variable ‘t’ [-Wunused-variable] int n, m, i, j, s, t, d, k, vf; ^ user.cpp:15:27: warning: unused variable ‘d’ [-Wunused-variable] int n, m, i, j, s, t, d, k, vf; ^ user.cpp:15:30: warning: unused variable ‘k’ [-Wunused-variable] int n, m, i, j, s, t, d, k, vf; ^ user.cpp:12:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alibaba.in","r",stdin); ^ user.cpp:13:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alibaba.out","w",stdout); ^ user.cpp:17:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n",&n,&m); ^ user.cpp:19:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",q); ^