POJ1025

这题主要是比较麻烦，要考虑的比较全面。题目大意是：有一栋楼，楼有10层，每层有10个房间，层与层之间用电梯连接，电梯每五秒搭载一个人。有序号为A到Z的26个人可能要来访问这栋楼，每个人可以访问一个或多个房间，并以房间号的升序对房间进行访问。然而每个房间里同一时刻只能有一个人，若有多个人要访问同一房间，则以字母升序的优先级进行访问，编号为A的人有最高的优先级，Z的优先级最低。不能立即访问房间的人在房间门前以字母升序优先级排成队列进行等待。对于电梯的使用也是一样的按字母优先级。

我的思路是以优先级降序的顺序对每个人进行处理：先对最高优先级的人要访问的每个房间进行处理，若有别人也要访问这个房间，则先处理这几个人的对该房间的访问，这中间使用迭代。每个人、每个房间和每个电梯都有一个当前时间，当前状态。考虑好这些，这题应该就不难了。 附上原题地址： http://poj.org/problem?id=1025 #include <iostream> #include <cstdlib> #include <cstdio> #include <string> #include <cmath> using namespace std; //每个人的状态： #define STS_ENTER_BUILDING 1 //进入大楼 #define STS_LEAVE_BUILDING 2 //离开大楼 #define STS_IN_ROOM 3 //在房间里 #define STS_WAIT_ROOM 4 //在房间外等候 #define STS_WAIT_ELEVATOR 5 //等电梯 //每个房间的状态： #define ROOM_BUSY 1 //房间里有人 #define ROOM_FREE 2 //房间里没人 class agent{ public: int sts; //当前状态 int ctime; //当前时间 int cfloor; //当前所在楼层 int sen; //优先级 int croom; //当前所在房间号 int nroom; //下一个房间号 int drooms[400]; //要去的房间 int nrooms; //要去的房间数目 int stytime[400]; //每个房间要待的时间 string tracestr; //访问轨迹 void initagent(); //初始化 int arrange(); //行程安排函数1 int arrange(int reqroom); //行程安排函数2 int arrange(int cuttime, int reqroom); //行程安排函数3 int waitele(); //等待电梯 int transfer(int nInd); //从一个房间到另一个房间 int stayroom(int reqroom, int entertime); //在房间里待着 agent(); //构造函数 }; class room{ public: room(); //构造函数 int req[30]; //要访问此房间的人 int finished[30]; //完成访问此房间的人 int ctime; //当前时间 int sts; //当前状态 int ftime; //下一次到达空闲的时间 }; class elevator{ public: elevator(); //构造函数 int btime[90000]; //不能进入的时间 }; agent ag[30]; room ros[2000]; elevator ele[20]; int main(void) { char ch,ctime[10]; int nr,nt,nch,i,j=0; cin>>ch; while (ch != '.') { nch = (int)ch - 64; ag[nch].sen = nch; cin>>ctime; ag[nch].ctime = ((int)ctime[0]-48)*36000 + ((int)ctime[1]-48)*3600 + ((int)ctime[3]-48)*600 + ((int)ctime[4]-48)*60 + ((int)ctime[6]-48)*10 + ((int)ctime[7]-48); cin>>nr; j = 0; while (nr !=0) { cin>>nt; ag[nch].drooms[j++] = nr; ag[nch].stytime[nr] = nt; ros[nr].req[nch] = 1; cin>>nr; } ag[nch].nrooms = j; ag[nch].initagent(); cin>>ch; } for (i=1; i<=26; i++) { if (ag[i].sen != 0 && ag[i].sts != STS_LEAVE_BUILDING) { ag[i].arrange(); } } for (i=1; i<=26; i++) { if (ag[i].sts != -1) { cout<<char(i+64)<<endl<<ag[i].tracestr<<endl; } } return 0; } int agent::arrange() { int i; if (sts == STS_WAIT_ELEVATOR) waitele(); for (i=nroom; i<nrooms; i++) { arrange(drooms[i]); transfer(i); } return 0; } int agent::transfer(int nInd) { int nt, nf; char str[100]; if (nInd == nrooms-1) { if (cfloor > 1) { nt = ctime + 10; sprintf(str, "d:d:d d:d:d Transfer from room d to elevator/n", ctime/3600, (ctime/60)`, ctime`, nt/3600, (nt/60)`, nt`, drooms[nroom]); tracestr += str; ctime = nt; nt = (5-ctime%5)%5 + ctime; while (ele[cfloor].btime[nt] != 0) nt += 5; if (nt != ctime) { sprintf(str, "d:d:d d:d:d Waiting in elevator queue/n", ctime/3600, (ctime/60)`, ctime`, nt/3600, (nt/60)`, nt`); tracestr += str; ctime = nt; } ele[cfloor].btime[nt] = 1; nf = (cfloor-1)*30 + ctime; sprintf(str, "d:d:d d:d:d Stay in elevator/n", ctime/3600, (ctime/60)`, ctime`, nf/3600, (nf/60)`, nf`); tracestr += str; ctime = nf; } nt = ctime + 30; sprintf(str, "d:d:d d:d:d Exit/n", ctime/3600, (ctime/60)`, ctime`, nt/3600, (nt/60)`, nt`); tracestr += str; sts = STS_LEAVE_BUILDING; ctime = nt; return 0; } nroom = nInd + 1; if (drooms[nroom]/100 > drooms[nInd]/100) waitele(); else { nt = ctime + 10; sprintf(str, "d:d:d d:d:d Transfer from room d to room d/n", ctime/3600, (ctime/60)`, ctime`, nt/3600, (nt/60)`, nt`, drooms[nInd], drooms[nroom]); tracestr += str; ctime = nt; } return 0; } int agent::waitele() { int nt, nf; char str[100]; if (nroom != 0) { nt = ctime + 10; sprintf(str, "d:d:d d:d:d Transfer from room d to elevator/n", ctime/3600, (ctime/60)`, ctime`, nt/3600, (nt/60)`, nt`, drooms[nroom-1]); tracestr += str; ctime = nt; } nt = (5-ctime%5)%5+ctime; while (ele[cfloor].btime[nt] != 0) nt += 5; if (nt != ctime) { sprintf(str, "d:d:d d:d:d Waiting in elevator queue/n", ctime/3600, (ctime/60)`, ctime`, nt/3600, (nt/60)`, nt`); tracestr += str; ctime = nt; } ele[cfloor].btime[nt] = 1; nf = (drooms[nroom]/100 - cfloor)*30 + ctime; sprintf(str, "d:d:d d:d:d Stay in elevator/n", ctime/3600, (ctime/60)`, ctime`, nf/3600, (nf/60)`, nf`); tracestr += str; ctime = nf + 10; sprintf(str, "d:d:d d:d:d Transfer from elevator to room d/n", nf/3600, (nf/60)`, nf`, ctime/3600, (ctime/60)`, ctime`, drooms[nroom]); tracestr += str; cfloor = drooms[nroom]/100; sts = STS_WAIT_ROOM; return 0; } int agent::arrange(int reqroom) { int i, qlist[30], nq=0, pro[30], flg=0, tmp1, tmp2, j=0, k, minp, mini, tmp; memset(qlist, 0, sizeof(qlist)); memset(pro, 0, sizeof(pro)); if (ros[reqroom].ftime >= ctime) { stayroom(reqroom, ros[reqroom].ftime); return 0; } for (i=sen+1; i<=26; i++) { if (ros[reqroom].req[i]!=0 && ros[reqroom].finished[i]==0 && ag[i].ctime<ctime) { tmp = ag[i].arrange(ctime, reqroom); if (tmp!=0) { qlist[j] = tmp; pro[j] = i; j++; } } } while (flg == 0) { flg = 1; for (i=0; i<j-1; i++) { if (qlist[i]>qlist[i+1] || (qlist[i]==qlist[i+1] && pro[i]>pro[i+1])) { flg = 0; tmp1 = qlist[i]; qlist[i] = qlist[i+1]; qlist[i+1] = tmp1; tmp2 = pro[i]; pro[i] = pro[i+1]; pro[i+1] = tmp2; } } } if (qlist[0] >= ctime || j==0) { stayroom(reqroom, ctime); return 0; } i = 0; nq = i; while (ctime>ros[reqroom].ftime) { while (ros[reqroom].finished[pro[nq]]!=0 && nq<j) nq++; if (nq == j) break; if (qlist[nq] > ros[reqroom].ftime) { ag[pro[nq]].stayroom(reqroom, qlist[nq]); ag[pro[nq]].transfer(ag[pro[nq]].nroom); nq++; continue; } i = nq; while (qlist[i]<=ros[reqroom].ftime) i++; minp = pro[nq]; mini = nq; for (k=nq; k<i; k++) { if (pro[k]<minp && ros[reqroom].finished[pro[k]]==0) {minp = pro[k];mini = k;} } ag[minp].stayroom(reqroom, ros[reqroom].ftime); ag[minp].transfer(ag[minp].nroom); } if (ctime <= ros[reqroom].ftime) { stayroom(reqroom, ros[reqroom].ftime); } else { stayroom(reqroom, ctime); } return 0; } int agent::arrange(int cuttime, int reqroom) { int i; if (nroom==0 && drooms[0]/100>1 && sts==STS_WAIT_ELEVATOR) { waitele(); } for (i=nroom; drooms[i]<reqroom && ctime<cuttime; i++) { arrange(drooms[i]); transfer(i); } if (ctime>=cuttime) return 0; else return ctime; } int agent::stayroom(int reqroom, int entertime) { int nt; char str[100]; nt = entertime + stytime[reqroom]; if (entertime > ctime) { sprintf(str, "d:d:d d:d:d Waiting in front of room d/n", ctime/3600, (ctime/60)`, ctime`, entertime/3600, (entertime/60)`, entertime`, reqroom); tracestr += str; ctime = entertime; } sprintf(str, "d:d:d d:d:d Stay in room d/n", ctime/3600, (ctime/60)`, ctime`, nt/3600, (nt/60)`, nt`, reqroom); tracestr += str; ctime = nt; ros[reqroom].finished[sen] = 1; ros[reqroom].ftime = ctime; return 0; } agent::agent() { sts = -1; ctime = 0; cfloor = 1; sen = 0; croom = 0; nroom = 0; nrooms = 0; memset(drooms, 0, sizeof(drooms)); memset(stytime, 0, sizeof(stytime)); tracestr = ""; } void agent::initagent() { char str[100]; cfloor = 1; if (drooms[0] <= 0) { sts = STS_LEAVE_BUILDING; return; } nroom = 0; sprintf(str, "d:d:d", ctime/3600, (ctime/60)`, ctime`); tracestr += str; ctime += 30; sprintf(str, " d:d:d Entry/n", ctime/3600, (ctime/60)`, ctime`); tracestr += str; if (drooms[0]/100 > 1) sts = STS_WAIT_ELEVATOR; else sts = STS_WAIT_ROOM; } room::room() { memset(req, 0, sizeof(req)); memset(finished, 0, sizeof(finished)); ctime = 0; sts = ROOM_FREE; ftime = 0; } elevator::elevator() { memset(btime, 0, sizeof(btime)); }