func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, k, x, v[10001], w[10001], f[10001], g[10001], ans = -1;   int main() {     scanf( %d%d , &n, &k);     for (int i = 1; i <= n; i++) scanf( %d , &v[i]);     for (int i = 1; i <= n; i++) {       scanf( %d , &x);       w[i] = v[i] - x * k;     }     for (int i = 1; i <= 10000; i++) f[i] = g[i] = -1 << 30;     for (int i = 0; i <= n; i++) {       if (w[i] >= 0)         for (int j = 10000; j >= w[i]; j--) f[j] = max(f[j - w[i]] + v[i], f[j]);     }     for (int i = 0; i <= n; i++) {       if (w[i] < 0)         for (int j = 10000; j >= -w[i]; j--) g[j] = max(g[j + w[i]] + v[i], g[j]);     }     for (int i = 0; i <= 10000; i++)       if (f[i] || g[i]) ans = max(ans, f[i] + g[i]);     printf( %d , ans);   }   