Compilare: user.cpp: In function ‘int main()’: user.cpp:14:21: warning: unused variable ‘s’ [-Wunused-variable] int n, i, j, k, s, t, d; ^ user.cpp:14:24: warning: unused variable ‘t’ [-Wunused-variable] int n, i, j, k, s, t, d; ^ user.cpp:14:27: warning: unused variable ‘d’ [-Wunused-variable] int n, i, j, k, s, t, d; ^ user.cpp:11:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("royfloyd.in","r",stdin); ^ user.cpp:12:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("royfloyd.out","w",stdout); ^ user.cpp:17:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:20:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i][j]); ^