POJ培训计划2253_Frogger(最短/floyd)

最新推荐文章于 2020-01-24 13:48:55 发布

weixin_34392906

最新推荐文章于 2020-01-24 13:48:55 发布

阅读量83

点赞数

本文介绍了一种基于Floyd算法解决Frogger游戏中石头间跳跃距离问题的方法。通过计算不同石头之间的最远距离来确定青蛙跳跃所需的最小范围，利用三维坐标计算石头间的实际距离，并通过Floyd算法找出两个特定石头之间的最小最大距离。

解决报告

意甲冠军：

乞讨0至1所有最大的道路值的最小数量。

思维：

floyd。

#include <iostream>
#include <cstdio>
#include <cstring>
#include <cmath>
#define inf 0x3f3f3f3f
using namespace std;
int n,m,q;
double mmap[210][210];
struct node {
    double x,y;
} p[210];
double dis(node p1,node p2) {
    return sqrt((p1.x-p2.x)*(p1.x-p2.x)+(p1.y-p2.y)*(p1.y-p2.y));
}
void floyd() {
    for(int k=0; k<n; k++)
        for(int i=0; i<n; i++)
            for(int j=0; j<n; j++)
                mmap[i][j]=min(mmap[i][j],max(mmap[i][k],mmap[k][j]));
}
int main() {
    int i,j,u,v,w,k=1;
    while(~scanf("%d",&n)) {
        if(!n)break;
        for(i=0; i<n; i++) {
            for(j=0; j<n; j++)
                mmap[i][j]=(double)inf;
            mmap[i][i]=0;
        }
        for(i=0; i<n; i++) {
            scanf("%lf%lf",&p[i].x,&p[i].y);
        }
        for(i=0; i<n; i++) {
            for(j=0; j<n; j++) {
                mmap[i][j]=dis(p[i],p[j]);
            }
        }
        floyd();
        printf("Scenario #%d\n",k++);
        printf("Frog Distance = %.3lf\n",mmap[0][1]);
        printf("\n");
    }
    return 0;
}

Frogger

Time Limit: 1000MS		Memory Limit: 65536K
Total Submissions: 25958		Accepted: 8431

Description

Freddy Frog is sitting on a stone in the middle of a lake. Suddenly he notices Fiona Frog who is sitting on another stone. He plans to visit her, but since the water is dirty and full of tourists' sunscreen, he wants to avoid swimming and instead reach her by jumping.
Unfortunately Fiona's stone is out of his jump range. Therefore Freddy considers to use other stones as intermediate stops and reach her by a sequence of several small jumps.
To execute a given sequence of jumps, a frog's jump range obviously must be at least as long as the longest jump occuring in the sequence.
The frog distance (humans also call it minimax distance) between two stones therefore is defined as the minimum necessary jump range over all possible paths between the two stones.

You are given the coordinates of Freddy's stone, Fiona's stone and all other stones in the lake. Your job is to compute the frog distance between Freddy's and Fiona's stone.

Input

The input will contain one or more test cases. The first line of each test case will contain the number of stones n (2<=n<=200). The next n lines each contain two integers xi,yi (0 <= xi,yi <= 1000) representing the coordinates of stone #i. Stone #1 is Freddy's stone, stone #2 is Fiona's stone, the other n-2 stones are unoccupied. There's a blank line following each test case. Input is terminated by a value of zero (0) for n.

Output

For each test case, print a line saying "Scenario #x" and a line saying "Frog Distance = y" where x is replaced by the test case number (they are numbered from 1) and y is replaced by the appropriate real number, printed to three decimals. Put a blank line after each test case, even after the last one.

Sample Input

Sample Output

Scenario #1
Frog Distance = 5.000

Scenario #2
Frog Distance = 1.414