Submission #970531

#	Time	Username	Problem	Language	Result	Execution time	Memory
970531		mychecksedad	Snake Escaping (JOI18_snake_escaping)	C++17	12 / 100	424 ms	65540 KiB

snake_escaping

/* Author : Mychecksdead  */
#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define pb push_back
#define all(x) x.begin(), x.end()
#define en cout << '\n'
const int N = 2e6+100, M = 1e5+10, K = 13, MX = 30;

int n, q, cost[N], dp[N], p[15];
short int val[N][K];
string s;
void solve(){
  cin >> n >> q >> s;
  if(n > 13) return;
  for(int i = 0; i < N; ++i) dp[i] = 0;
  for(int i = 0; i < (1<<n); ++i){
    int val = 0;
    for(int j =0 ; j < n; ++j){
      if((1<<j)&i) val += 2*p[j];
      else val += p[j];
    }
    dp[val] += s[i] - '0';
  }

  // for(int i = 0; i < p[n]; ++i){
  //   cout << i << ": "; for(int j = 0; j < 5; ++j) cout << val[i][j];
  //   en;
  // }

  for(int i = 0; i < n; ++i){
    for(int mask = 0; mask < p[n]; ++mask){
      if(val[mask][i] == 0){
        dp[mask] += dp[mask + p[i]];
        dp[mask] += dp[mask + 2*p[i]];
      }
    }
  }

  for(int i = 0; i < q; ++i){
    string t; cin >> t;
    int val = 0;
    for(int j = 0; j < n; ++j){
      if(t[n - j - 1] == '0') val += p[j];
      else if(t[n - j - 1] == '1') val += p[j] * 2;
    }
    cout << dp[val] << '\n';
  }
}



int main(){
  cin.tie(0); ios::sync_with_stdio(0);
  int tt = 1, aa;
  p[0] = 1;
  for(int i = 1; i <15; ++i) p[i] = p[i - 1] * 3;
  for(int i = 0; i < N; ++i){
    int x = i;
    for(int j = 0; j < K; ++j){
      val[i][j] = x % 3;
      x /= 3;
    }
  }
  // freopen("in.txt", "r", stdin);
  // freopen("out.txt", "w", stdout);
  // cin >> tt;
  while(tt--){
    solve();
    // en;
  }
  cerr<<"time taken : "<<(float)clock()/CLOCKS_PER_SEC<<" seconds\n";
  return 0;
} 

Compilation message (stderr)

snake_escaping.cpp: In function 'int main()':
snake_escaping.cpp:57:15: warning: unused variable 'aa' [-Wunused-variable]
   57 |   int tt = 1, aa;
      |               ^~

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 0 / 10
• Subtask 4: 0 / 53
• Subtask 5: 0 / 25