咋做啊

我试了好几次，老是WA😭

#include<bits/stdc++.h>
using namespace std;

int dp[300][300];
int main(){
    int n,m,l,r;
    cin>>n>>m;
    dp[0][1]=1;
    for (int i = 1; i <= m; i++){
        for (int j = 1; j <= n; j++){
            l=(j-2+n)%n+1;
            r=(j+1)%n+1;
            dp[i][j] = dp[i-1][l] + dp[i-1][r];}}
    cout<<dp[m][1]<<endl;
}