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裸的双调旅行商问题啦
#include <stdio.h> #include <string.h> #include <iostream> #include <math.h> #include <queue> #include <set> #include <algorithm> #include <stdlib.h> using namespace std; #define ll int #define N 550 #define inf 1152921504606846976 struct node{ double x, y; bool operator<(const node&a)const{ if(a.x==x)return a.y>y; return a.x>x; } void put(){ printf("(%.0f, %.0f)\n", x, y); } }p[N]; double Dis(node a, node b){return sqrt((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y));} int n; double dis[N][N],dp[N][N]; int main(){ ll i, j, u, v; int T; scanf("%d", &T); while(T-->0){ scanf("%d", &n); for(i=1;i<=n;i++)scanf("%lf %lf",&p[i].x,&p[i].y); sort(p+1,p+n+1); // for(int i = 1; i <= n; i++)p[i].put(); for(i=1;i<=n;i++)for(j=1;j<=n;j++)dis[i][j] = Dis(p[i],p[j]), dp[i][j] = inf; dp[1][1] = 0; for(i=2;i<=n;i++) { for(j = 1;j < i; j++) { dp[i][j] = min(dp[i-1][j]+dis[i][i-1], dp[i][j]); dp[i][i-1] = min(dp[i-1][j]+dis[j][i], dp[i][i-1]); } } printf("%.10f\n",dp[n][n-1]+dis[n][n-1]); } return 0; }
CSU 1527 Bounty Hunter dp 双调旅行商
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原文地址:http://blog.csdn.net/qq574857122/article/details/44698705