Luo Gu P1754 fan ticket issue

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Problem-solving ideas:

F [i] [j] denotes the number of the j-th program 100 i-50.

AC Code:

 1 #include<iostream>
 2 #include<cstdio>
 3 
 4 using namespace std;
 5 
 6 long long n,f[22][22];
 7 
 8 int main() {
 9     scanf("%lld",&n);
10     for(int i = 1;i <= n; i++)
11         f[i][0] = 1;
12     for(int i = 1;i <= n; i++)
13         for(int j = 1;j <= i; j++)
14             f[i][j] = f[i-1][j] + f[i][j-1];
15     printf("%lld",f[n][n]);
16     return 0;
17 }