离奇的报错

#include <bits/stdc++.h>
using namespace std;
long long n,m,a[1010][1010],dp[1010][1010][3];
//dp...[0]：从上转移
//dp...[1]：从下转移
//dp...[2]：从左转移 
long long mx(int x,int y){
	return max({dp[x][y][0],dp[x][y][1],dp[x][y][2]});
}
int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	//freopen(".in","r",stdin);
	//freopen(".out","w",stdout);
	cin>>n>>m;
	for(int i=1;i<=n;i++){
		for(int j=1;j<=m;j++){
			cin>>a[i][j];
		}
	}
	for(int i=1;i<=n;i++){
		for(int j=1;j<=m;j++){
			dp[i][j][0]=max({dp[i][j-1][0],dp[i][j-1][2],mx(i-1,j)})+a[i];
			dp[i][j][1]=max({dp[i][j+1][1],dp[i][j+1][2],mx(i-1,j)})+a[i];
			dp[i][j][2]=mx(i-1,j)+a[i];
		} 
	}
	cout<<mx(n,m);
	return 0;
}

24	60	C:\Users\Administrator\Desktop\C++文件包\P7074.cpp	[Error] invalid conversion from 'int*' to 'int' [-fpermissive]