POJ3176

#include<iostream>
#define N 350
using namespace std;
int main()
{
	int n,max;
	int t[N+1][N+1]={0},dp[N+2][N+2]={0};
	cin>>n;
	for(int i = 1;i<=n;i++)
		for(int j = 1;j<=i;j++) cin>>t[i][j];
	max = t[1][1];
	for(int i = 1;i<=n+1;i++)
	{
		for(int j = 1;j<=n+1;j++){
			int tmp1,tmp2;
			tmp1 = dp[i-1][j-1] + t[i-1][j-1];
			tmp2 = dp[i-1][j] + t[i-1][j];
			dp[i][j] = (tmp1>tmp2)?tmp1:tmp2;
			max = dp[i][j]>max?dp[i][j]:max;
		}
	}
	cout<<max<<endl;
}