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62 lines (53 loc) · 1 KB
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#include<bits/stdc++.h>
using namespace std;
#define deb(x) cout<<#x<<'='<<x<<endl;
#define fastio() ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define ll long long
int binary_expo(int a,int b);
int dp[1001][1001];
int mod=1e9+7;
void solve()
{
int n;
cin>>n;
string s[n+1];
for(int i=0;i<n;i++)
{
cin>>s[i];
}
dp[0][0]=1;
for(int i=0;i<n;i++)
{
for(int j=0;j<n;j++)
{
if(i) dp[i][j]+=dp[i-1][j];
if(j) dp[i][j]+=dp[i][j-1];
if(s[i][j]=='*')
{
dp[i][j]=0;
}
dp[i][j]=dp[i][j]%mod;
}
}
cout<<dp[n-1][n-1]<<endl;
}
int main()
{
fastio();
/* #ifndef ONLINE_JUDGE
freopen( , ,stdin);
freopen( , ,stdout);
#endif */
solve();
return 0;
}
int binary_expo(int a,int b)
{
int result=1;
while(b>0){
if(b%2!=0){ result=result*a; }
a=a*a;
b=b/2;
}
return result;
}