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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. typedef long long ll;
  4. const int Mod=1e9+7;
  5. const ll INF = -10000000000000;
  6.  
  7. void solve() {
  8.    int n;
  9.    cin >> n;
  10.    vector<char> a[n];
  11.    for(int i=0;i<n;i++){
  12.       for(int j=0;j<n;j++){
  13.         char c;
  14.         cin >> c;
  15.         a[i].push_back(c);
  16.       }
  17.    }
  18.    vector<vector<int>> ans(n,vector<int>(n,0));
  19.    ans[0][0]=1;
  20.    for(int i=0;i<n;i++){
  21.      for(int j=0;j<n;j++){
  22.      	if(a[i][j]=='*') continue;
  23.         if(j+1<n) ans[i][j+1]+=ans[i][j]%Mod;
  24.         if(i+1<n) ans[i+1][j]+=ans[i][j]%Mod;
  25.      }
  26.    }
  27.    cout << ans[n-1][n-1];
  28. }       
  29.  
  30. int main(){ 
  31.     ios::sync_with_stdio(false);
  32.     cin.tie(nullptr);
  33.  
  34.     /*int t;
  35.     cin >> t;
  36.     while (t--)*/ solve();
  37.  
  38.  
  39.     return 0;
  40. }
  41.  
Success #stdin #stdout 0.01s 5272KB
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https://ideone.com/MHCmrj
language:
C++ (gcc 8.3)
created:
9 days ago
visibility:
public

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