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  • poj 1163 The Triangle

    The Triangle
    Time Limit: 1000MS   Memory Limit: 10000K
    Total Submissions: 43809   Accepted: 26430

    Description

    7
    3 8
    8 1 0
    2 7 4 4
    4 5 2 6 5

    (Figure 1)
    Figure 1 shows a number triangle. Write a program that calculates the highest sum of numbers passed on a route that starts at the top and ends somewhere on the base. Each step can go either diagonally down to the left or diagonally down to the right.

    Input

    Your program is to read from standard input. The first line contains one integer N: the number of rows in the triangle. The following N lines describe the data of the triangle. The number of rows in the triangle is > 1 but <= 100. The numbers in the triangle, all integers, are between 0 and 99.

    Output

    Your program is to write to standard output. The highest sum is written as an integer.

    Sample Input

    5
    7
    3 8
    8 1 0 
    2 7 4 4
    4 5 2 6 5

    Sample Output

    30

    就是一数字金字塔
    记忆化搜索直接过
    #include<cstdio>
    #include<iostream>
    #define ref(i,x,y) for(int i=x;i<=y;i++)
    #define N 101
    int a[N][N],f[N][N],n;
    using namespace std;
    int dfs(int i,int j){
        if(f[i][j]>0) return f[i][j];
        return f[i][j]=a[i][j]+(i==n?0:max(dfs(i+1,j),dfs(i+1,j+1)));
    }
    int main(){
        scanf("%d",&n);
        ref(i,1,n) ref(j,1,i) scanf("%d",&a[i][j]);
        dfs(1,1);
        printf("%d
    ",f[1][1]);
        return 0;
    }

    看不懂,没关系,还有一种

    #include<cstdio>
    #include<iostream>
    #define ref(i,x,y) for(int i=x;i<=y;i++)
    #define def(i,x,y) for(int i=x;i>=y;i--)
    #define N 101
    int a[N][N],f[N][N],n;
    using namespace std;
    int main(){
        scanf("%d",&n);
        ref(i,1,n) ref(j,1,i) scanf("%d",&a[i][j]);
        ref(i,1,n) f[n][i]=a[n][i];
        def(i,n-1,1) ref(j,1,i) f[i][j]+=a[i][j]+max(f[i+1][j],f[i+1][j+1]);
        printf("%d
    ",f[1][1]);
        return 0;
    }
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  • 原文地址:https://www.cnblogs.com/shenben/p/5495357.html
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