24 lines
483 B
C++
24 lines
483 B
C++
#include<iostream>
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#include<algorithm>
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#include<cstring>
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using namespace std;
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int main()
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{
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int n,p,m,t;
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while(cin >> n >> p >> m >> t)
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{
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long long s[110][110];
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memset(s,0,sizeof(s));
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s[0][p] = 1;
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for(int i = 1;i <= m;i++)
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{
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for(int j = 1;j <= n;j++)
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{
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s[i][j] = s[i-1][j-1] + s[i-1][j+1];
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}
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}
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cout << s[m][t] << endl;
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}
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return 0;
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}
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