Submission #1210022

#	Time	Username	Problem	Language	Result	Execution time	Memory
1210022		i_love_spring	Jump (BOI06_jump)	C++20	5 / 100	1096 ms	488 KiB

jump

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ar array
void solve() {  
  int n;
  cin >> n;
  vector<vector<int>> a(n + 1,vector<int>(n + 1));
  vector<vector<ll>> dp(n + 1,vector<ll>(n + 1, 0));
  for (int i = 1;i <= n;i++) {
    for (int j = 1; j <= n;j++) cin >> a[i][j];
  }
  if (a[n][n] != 0) {
    cout << 0;
    return;
  }
  dp[1][1] = 1;
  function<void(int,int)> dfs = [&](int x,int y) {
    if (a[x][y] == 0) return;
    if (x + a[x][y] <= n) {
      dp[x + a[x][y]][y] += dp[x][y];
      dfs(x + a[x][y],y);
    }
    if (y + a[x][y] <= n) {
      dp[x][y + a[x][y]] += dp[x][y];
      dfs(x, y + a[x][y]);
    }
  };
  dp[1][1] = 1;
  dfs(1,1);
  cout << dp[n][n];
}
signed main() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
  cout.tie(nullptr);
  int t = 1;
//  cin >> t;
  while (t--) {
    solve();
    cout << "\n";
  }
  return 0;
} 

• Subtask 1: 5 / 100