PAT_1047. Student List for Course
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//// main.cpp// PAT_1047. Student List for Course//// Created by wjq on 17/5/11.// Copyright © 2017年 wjq. All rights reserved.//#include <iostream>#include <algorithm>#include <vector>#include <string.h>using namespace std;int N,K,C,course;vector<int> m[2505];string student[40005];int cmp(int a,int b){ return student[a]<student[b];}int main(int argc, const char * argv[]){ scanf("%d%d",&N,&K); for(int i=0;i<N;i++) //i作为学生编号,从0开始 { //输入学生名字 char name[10]; scanf("%s%d",name,&C); student[i]=name; for(int j=0;j<C;j++) { scanf("%d",&course); //course为课程编号,从1开始 m[course-1].push_back(i); } } for(int i=0;i<K;i++) //i为课程编号,从0开始. { sort(m[i].begin(),m[i].end(),cmp); printf("%d %lu\n",i+1,m[i].size()); for(int j=0;j<m[i].size();j++) printf("%s\n",student[m[i][j]].c_str()); } return 0;}
被这题的第四个点卡了很久超时...瞎改瞎改过了....
一开始 我用的 map<int,vector<int> > m 来存课程id与学生id的关系,后来改成vector<int> m[2505],这样就不超时了.
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