Sort 对下标进行排序

#include <cstring>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <memory.h>
#include <cassert>

using namespace std;

int a[10000];
int b[10000];
bool cmp(int c, int b)
{
    return a[c] < a[b];
}
int main(){
    int n; 
    scanf("%d",&n);
    for(int i = 1;i <= n;i ++)
        scanf("%d",&a[i]);
    for(int j = 1;j <= n;j ++)
        b[j] = j ; 
    sort(b+1,b+n+1,cmp);
    for(int j = 1;j <= n;j ++)
        printf("%d ",b[j]);
    printf("\n");
    return 0 ; 
}