学步园

经典DP例子

#include <cstdio>
#include <cstring>
#include <iostream>
using namespace std;
int const MAXN = 110;
int a[MAXN][MAXN],dp[MAXN][MAXN];
inline int Max(int a,int b){
    return a>b?a:b;
}
int main(){
    int c;
    while(~scanf("%d",&c)){
        while(c--){
            int n;
            scanf("%d",&n);
            memset(dp,0,sizeof(dp));
            for(int i = 1;i <= n;i++){
                for(int j = 1;j <= i;j++){
                    scanf("%d",&a[i][j]);
                }
            }
            for(int i = n;i >= 1;i--){
                for(int j = i;j >= 1;j--){
                    dp[i][j] = Max(dp[i+1][j],dp[i+1][j+1]) + a[i][j];
                }
            }
            printf("%d\n",dp[1][1]);
        }
    }
    return 0;
}