func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long mod = 1000000007;   int n, k;   bool d[1001];   long long dp[1001][2][1001];   int cnt[10001];   long long DP(int i, bool f, int j) {     if (i == n) return cnt[j] == k;     if (dp[i][f][j] != -1) return dp[i][f][j];     long long ret = 0;     if (d[i] == 1)       ret = (ret + DP(i + 1, f, j + 1)) % mod;     else if (d[i] == 0 and f)       ret = (ret + DP(i + 1, f, j + 1)) % mod;     ret = (ret + DP(i + 1, f | (d[i] == 1), j)) % mod;     return dp[i][f][j] = ret;   }   int main() {     for (int i = 1; i <= 1000; i++) {       cnt[i] = 1 + cnt[__builtin_popcount(i)];     }     string s;     cin >> s;     n = s.size();     cin >> k;     int i = 0;     for (char c : s) d[i++] = c -  0 ;     memset(dp, -1, sizeof dp);     cout << DP(0, 0, 0) - (k == 1);   }   