Compilare: user.cpp: In function ‘int main()’: user.cpp:21:21: warning: unused variable ‘s’ [-Wunused-variable] int n, i, j, k, s, t, d; ^ user.cpp:21:24: warning: unused variable ‘t’ [-Wunused-variable] int n, i, j, k, s, t, d; ^ user.cpp:21:27: warning: unused variable ‘d’ [-Wunused-variable] int n, i, j, k, s, t, d; ^ user.cpp:18:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rf.in","r",stdin); ^ user.cpp:19:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rf.out","w",stdout); ^ user.cpp:23:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:26:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[ i ][ j ]); ^