问出错点

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

const int N=1e2+10;
int n,m,a[N];
int ans,dp[N][N];

signed main()
{
	scanf("%lld%lld",&n,&m);
	while(n--)
	{
		for(int i=1;i<=m;++i)
		{
			scanf("%lld",&a[i]);
		}
		for(int k=1;k<=m;++k)
		{
			for(int i=1;i+k-1<=m;++i)
			{
				int ed=i+k-1;
				dp[i][ed]=max( dp[i][ed],dp[i+1][ed]+a[i]*(1<<m-k+1) );
				dp[i][ed]=max( dp[i][ed],dp[i][ed-1]+a[ed]*(1<<m-k+1) );
//				cout<<i<<" "<<ed<<":"<<dp[i][ed]<<endl; 
			}
		}
		ans+=dp[1][m];
	}
	printf("%lld",ans);
	return 0;
}