Traveling by Stagecoach state Compression Bare Topic

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　Traveling by Stagecoach

DP[S][V] from the source point to V, the state is the minimum value of s,v. The For loop enumeration is OK.

1#include <iostream>2#include <cstdio>3#include <cstring>4#include <cmath>5#include <algorithm>6#include <string>7#include <vector>8#include <Set>9#include <map>Ten#include <stack> One#include <queue> A#include <sstream> -#include <iomanip> - using namespacestd; thetypedefLong LongLL; - Const Doubleinf=0x4fffffff; - Const Doubleexp=1e-5; - Const intms=Ten; + Const intSize= to; -  + Doubledp[1<<MS] [SIZE]; A  at intEdges[size][size]; - intCnt[ms]; -  - intStart,final,tickets,citys,edge; -  - voidSolve () in { -        for(intI=0;i< (1<<tickets); i++) toFill (dp[i],dp[i]+size,inf); +dp[(1<<tickets)-1][start-1]=0; -       Doubleres=INF; the        for(intI= (1<<tickets)-1; i>=0; i--) *       { $Res=min (res,dp[i][final-1]);Panax Notoginseng              for(intu=0; u<citys;u++) -             { the                    for(intj=0; j<tickets;j++) +                   { A                         if((I&GT;&GT;J) &1) the                         { +                                for(intv=0; v<citys;v++) -                                     if(edges[u][v]>=0) $dp[i-(1&LT;&LT;J)][v]=min (dp[i-(1&LT;&LT;J)][v],dp[i][u]+Double(Edges[u][v])/cnt[j]); $                         } -                   } -             } the       } -       if(res+exp>=INF)Wuyiprintf"impossible\n"); the       Else -printf"%.3lf\n", res); Wu } -  About intMain () $ { -        while(SCANF ("%d%d%d%d%d", &tickets,&citys,&edge,&start,&final) = =5&&tickets) -       { -  A              for(intI=0; i<tickets;i++) +             { thescanf"%d",&cnt[i]); -             } $memset (edges,-1,sizeof(edges)); the              for(intI=0; i<edge;i++) the             { the                   intx, y, z thescanf"%d%d%d",&x,&y,&z); -edges[x-1][y-1]=edges[y-1][x-1]=Z; in             } the solve (); the       } About       return 0; the}

Traveling by Stagecoach state Compression Bare Topic