1028. List Sorting (25)
2014-01-25 23:19
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Excel can sort records according to any column. Now you are supposed to imitate this function.
Input
Each input file contains one test case. For each case, the first line contains two integers N (<=100000) and C, where N is the number of records and C is the column that you are supposed to sort the records with. Then N lines follow, each contains a record
of a student. A student's record consists of his or her distinct ID (a 6-digit number), name (a string with no more than 8 characters without space), and grade (an integer between 0 and 100, inclusive).
Output
For each test case, output the sorting result in N lines. That is, if C = 1 then the records must be sorted in increasing order according to ID's; if C = 2 then the records must be sorted in non-decreasing order according to names; and if C = 3 then the
records must be sorted in non-decreasing order according to grades. If there are several students who have the same name or grade, they must be sorted according to their ID's in increasing order.
Sample Input 1
Sample Output 1
Sample Input 2
Sample Output 2
Sample Input 3
Sample Output 3
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Input
Each input file contains one test case. For each case, the first line contains two integers N (<=100000) and C, where N is the number of records and C is the column that you are supposed to sort the records with. Then N lines follow, each contains a record
of a student. A student's record consists of his or her distinct ID (a 6-digit number), name (a string with no more than 8 characters without space), and grade (an integer between 0 and 100, inclusive).
Output
For each test case, output the sorting result in N lines. That is, if C = 1 then the records must be sorted in increasing order according to ID's; if C = 2 then the records must be sorted in non-decreasing order according to names; and if C = 3 then the
records must be sorted in non-decreasing order according to grades. If there are several students who have the same name or grade, they must be sorted according to their ID's in increasing order.
Sample Input 1
3 1 000007 James 85 000010 Amy 90 000001 Zoe 60
Sample Output 1
000001 Zoe 60 000007 James 85 000010 Amy 90
Sample Input 2
4 2 000007 James 85 000010 Amy 90 000001 Zoe 60 000002 James 98
Sample Output 2
000010 Amy 90 000002 James 98 000007 James 85 000001 Zoe 60
Sample Input 3
4 3 000007 James 85 000010 Amy 90 000001 Zoe 60 000002 James 90
Sample Output 3
000001 Zoe 60 000007 James 85 000002 James 90 000010 Amy 90
此题的关键是用C++的流来完成输入时最后一个测试点会通不过 改用scanf 和 printf函数来完成!
#include <iostream> #include <algorithm> #include <stdio.h> #include <string.h> using namespace std; struct Stu{ int id; char name[20]; int grade; }; bool compare1(Stu a,Stu b){ return a.id<b.id; } bool compare2(Stu a,Stu b){ if(strcmp(a.name,b.name)!=0) return strcmp(a.name,b.name)<0; else return a.id<b.id; } bool compare3(Stu a,Stu b){ if(a.grade!=b.grade) return a.grade<b.grade; else return a.id<b.id; } int main() { int N,C; cin>>N>>C; Stu *arr = new Stu ; for(int i=0;i<N;i++){ scanf("%d%s%d",&arr[i].id,arr[i].name,&arr[i].grade); } if(C==1){ sort(arr,arr+N,compare1); } if(C==2){ sort(arr,arr+N,compare2); } if(C==3){ sort(arr,arr+N,compare3); } for(int i=0;i<N;i++){ printf("%06d %s %d\n", arr[i].id, arr[i].name, arr[i].grade); } return 0; }
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