poj 3176 Cow Bowling dp

#include<iostream>

using namespace std;

int a[400][400];
int f[400][400];

int main()
{
int n;
cin>>n;
for(int i=0;i<n;i++)
{
for(int j=0;j<i+1;j++)
cin>>a[i][j];

}

for(int i=0;i<n;i++)
f[n-1][i]=a[n-1][i];

for(int i=n-2;i>=0;i--)
{
for(int j=0;j<i+1;j++)
{
f[i][j]=a[i][j];
f[i][j]+=f[i+1][j]>f[i+1][j+1]?f[i+1][j]:f[i+1][j+1];
}
}

cout<<f[0][0]<<endl;

}

f[i][j]=a[i][j];
f[i][j]+=f[i+1][j]>f[i+1][j+1]?f[i+1][j]:f[i+1][j+1];

f[i][j]=a[i][j]+f[i+1][j]>f[i+1][j+1]?f[i+1][j]:f[i+1][j+1];