Compilare: user.cpp: In function ‘int main()’: user.cpp:15:18: warning: unused variable ‘t’ [-Wunused-variable] int n, i, j, t, s, d, k, x, y, ma, mi; ^ user.cpp:15:21: warning: unused variable ‘s’ [-Wunused-variable] int n, i, j, t, s, d, k, x, y, ma, mi; ^ user.cpp:15:24: warning: variable ‘d’ set but not used [-Wunused-but-set-variable] int n, i, j, t, s, d, k, x, y, ma, mi; ^ user.cpp:15:27: warning: unused variable ‘k’ [-Wunused-variable] int n, i, j, t, s, d, k, x, y, ma, mi; ^ user.cpp:15:40: warning: variable ‘mi’ set but not used [-Wunused-but-set-variable] int n, i, j, t, s, d, k, x, y, ma, mi; ^ user.cpp:12:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sotron.in","r",stdin); ^ user.cpp:13:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sotron.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:19:57: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for( j = 1; j <= n; ++j ) scanf("%d",&qq[i][j]); ^