53 lines
1.3 KiB
C++
53 lines
1.3 KiB
C++
#include <iostream>
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#include <cstdio>
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#include <cstring>
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#include <cmath>
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#include <algorithm>
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#include <vector>
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using namespace std;
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#define ll long long
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char a[100];
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ll dp[22][22][22];
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int main ()
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{
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while(scanf("%s",a)!=EOF)
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{
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if(a[0]=='-')
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{
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printf("0\n");
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continue;
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}
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memset(dp,0,sizeof(dp));
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dp[1][0][1]=1;
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int cnt=0;
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for(int i=1;i<strlen(a);++i)
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{
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if(a[i]=='-')
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{
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cnt++;
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for(int j=0;j<i;++j)
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for(int k=0;k<=i;++k)
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{
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if(i-j-k>0)
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dp[i+1][j+1][k]+=dp[i][j][k]*(i-j-k);
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if(k)
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dp[i+1][j+1][k-1]+=dp[i][j][k]*k;
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}
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}
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else
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{
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for(int j=0;j<=i;++j)
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for(int k=0;k<=i;++k)
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{
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dp[i+1][j][k+1]+=dp[i][j][k];
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if(i-j-k>0)
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dp[i+1][j][k+1]+=dp[i][j][k]*(i-j-k);
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dp[i+1][j][k]+=dp[i][j][k]*k;
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}
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}
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}
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cout<<dp[strlen(a)][cnt][0]<<endl;
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}
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return 0;
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}
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