1047. Student List for Course (25)
2016-09-16 15:31
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1047. Student List for Course (25)
时间限制
400 ms
内存限制
64000 kB
代码长度限制
16000 B
判题程序
Standard
作者
CHEN, Yue
Zhejiang University has 40000 students and provides 2500 courses. Now given the registered course list of each student, you are supposed to output the student name lists of all the courses.
Input Specification:
Each input file contains one test case. For each case, the first line contains 2 numbers: N (<=40000), the total number of students, and K (<=2500), the total number of courses. Then N lines follow, each contains a student's name (3 capital English letters
plus a one-digit number), a positive number C (<=20) which is the number of courses that this student has registered, and then followed by C course numbers. For the sake of simplicity, the courses are numbered from 1 to K.
Output Specification:
For each test case, print the student name lists of all the courses in increasing order of the course numbers. For each course, first print in one line the course number and the number of registered students, separated by a space. Then output the students'
names in alphabetical order. Each name occupies a line.
Sample Input:
10 5 ZOE1 2 4 5 ANN0 3 5 2 1 BOB5 5 3 4 2 1 5 JOE4 1 2 JAY9 4 1 2 5 4 FRA8 3 4 2 5 DON2 2 4 5 AMY7 1 5 KAT3 3 5 4 2 LOR6 4 2 4 1 5
Sample Output:
1 4 ANN0 BOB5 JAY9 LOR6 2 7 ANN0 BOB5 FRA8 JAY9 JOE4 KAT3 LOR6 3 1 BOB5 4 7 BOB5 DON2 FRA8 JAY9 KAT3 LOR6 ZOE1 5 9 AMY7 ANN0 BOB5 DON2 FRA8 JAY9 KAT3 LOR6 ZOE1
换了快排,最后一个不超时了。
#include <stdio.h> #include <stdlib.h> #include <string.h> typedef struct course_ { int count; char student[400][5]; }COURSE; int cmp(const void *a,const void *b) { char *A,*B; A = (char*)a; B = (char*)b; return strcmp(A,B); } int main() { int N,C,K,i,j,index; COURSE course[2510]; char name[5]; scanf("%d%d",&N,&K); for(i=1;i<=K;i++) //course初始化 { course[i].count = 0; } for(i=0;i<N;i++) { scanf("%s%d",name,&C); for(j=0;j<C;j++) { scanf("%d",&index); strcpy(course[index].student[course[index].count],name); course[index].count++; } } for(i=1;i<=K;i++) { qsort(course[i].student,course[i].count,sizeof(course[i].student[0]),cmp); } for(i=1;i<=K;i++) { printf("%d %d\n",i,course[i].count); for(j=0;j<course[i].count;j++) { puts(course[i].student[j]); } } //system("pause"); return 0; }
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