uva1660_ Patrol Robot (state BFS)

Source: Internet
Author: User

Disclaimer: This document is subject to the following agreement free reprint-non-commercial-non-derivative-retention Attribution | Creative Commons by-nc-nd 3.0
To view the update and discussion of this article, please click here: http://blog.csdn.net/tt2767
Link is deleted please Baidu: CSDN tt2767

Build a three-dimensional array d[n][n][n], the first two dimensions is the coordinates, the third dimension is the blood bar, it means that when the blood bar is HP, whether it passes this. Use the structure to record the number of steps, the state output can be judged.

#include <iostream>#include <algorithm>#include <cstdio>#include <cstdlib>#include <cstring>#include <queue>using namespace STD;Const Long DoublePI =ACOs(0.0) *2.0;Const intN = -;Const intDx[] = {0,1,0,-1};Const intDy[] = {-1,0,1,0};intN,m,k;structp{intx,y,hp,cnt;//hp is a blood bar, each pass barrier-1, CNT is the current number of stepsPintx =0,inty =0,intHP =0,intCNT =0): x (x), Y (y), hp (ph), CNT (CNT) {}};intD[n][n][n];//The ph value of the third dimension at the same time as this coordinateintG[n][n];intBFS ();intMain () {intcase;scanf("%d", &case);memset(g,-1,sizeof(G));//Remember to reset the map     while(case--) {scanf("%d%d%d", &m,&n,&k);//k is the maximum value of the blood bar         for(inti =0; I <m; i++) {GetChar ();//absorb ' \ n '             for(intj =0; J < N; J + +)scanf("%d", &g[i][j]); }printf("%d\n", BFS ()); }return  0;}intBFS () {memset(d,0,sizeof(d)); P S (0,0K0), G (M-1, N-1K0); d[0][0][K] =1; queue<P>Q Q.push (s); while(!q.empty ()) {p p = q.front (); Q.pop ();if(p.x = = g.x &&p.y = = g.y)returnp.cnt;//Reach the end of return steps        if(P.HP >=0)//have blood to keep walking{P tmp; for(inti =0; i<4;                i++) {tmp.x = p.x + dx[i];                TMP.Y = p.y + dy[i]; TMP.HP = G[tmp.x][tmp.y]? P.HP-1K//Met 0 o'clock full blood recoverytmp.cnt = p.cnt +1;if(0<= tmp.x && tmp.x < M &&0<= tmp.y && tmp.y <= n && d[tmp.x][tmp.y][tmp.hp] = =0&& tmp.hp >=0) {D[TMP.X][TMP.Y][TMP.HP] =1;                Q.push (TMP); }            }        }    }if(Q.empty ())return-1;//did not reach the end point}

Copyright NOTICE: This article for Bo Master original article, allow non-commercial reprint, reprint must note name author (CSDN tt2767) and this blog link: http://blog.csdn.net/tt2767.

uva1660_ patrol Robot (state BFS)

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.