题目1144:Freckles(最小生成树进阶)
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题目链接:http://ac.jobdu.com/problem.php?pid=1144
详解链接:https://github.com/zpfbuaa/JobduInCPlusPlus
参考代码:
// // 1144 Freckles.cpp // Jobdu // // Created by PengFei_Zheng on 18/04/2017. // Copyright © 2017 PengFei_Zheng. All rights reserved. // #include <stdio.h> #include <iostream> #include <algorithm> #include <string.h> #include <cmath> #define MAX_SIZE 110 using namespace std; int tree[MAX_SIZE]; int findRoot(int x){// find the root of x if(tree[x] == -1) return x; else{ int tmp = findRoot(tree[x]); tree[x] = tmp; return tmp; } } struct Edge{// define the edge which have line a and line b int a, b; double cost; // the length of point a to point b bool operator < (const Edge &A) const{ return cost < A.cost; } }; struct Point{//define the point double x, y;//(x,y) the position of this dot double getDistance(Point A){//get the lenght between (x,y) and (A.x, A.y) double tmp = (x-A.x)*(x-A.x) + (y-A.y)*(y-A.y); return sqrt(tmp); } }; int n; int main(){ while(scanf("%d",&n)!=EOF){ Edge edge[n*(n-1)/2+1]; Point point[n+1]; for(int i = 1 ; i <= n ; i++){ scanf("%lf%lf",&point[i].x,&point[i].y);//input the pos of (x,y) tree[i]=-1;//init the node i } int line_id = 0;//define the id of the line for(int i = 1 ; i <= n ; i++){ for(int j = i+1 ; j <= n ; j++){ edge[line_id].a = i; edge[line_id].b = j; edge[line_id].cost = point[i].getDistance(point[j]);//cal the length point[i] to point[y] line_id++; } } sort(edge,edge+line_id);// from low to high double ans = 0; for(int i = 0 ; i < line_id ; i++){ int a = findRoot(edge[i].a); int b = findRoot(edge[i].b); if(a!=b){//merge the a node to b‘s aggregate tree[a] = b; ans += edge[i].cost; } } printf("%.2lf\n",ans); } return 0; } /************************************************************** Problem: 1144 User: zpfbuaa Language: C++ Result: Accepted Time:10 ms Memory:1520 kb ****************************************************************/
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