sort_index_to_local_array.c

#include <stdio.h>
#include <stdlib.h>

int main(){
    int value[] = {2,5,4,3,8,7,9,1,10,6};
    int index[] = {0,1,2,3,4,5,6,7,8,9};

    int cmp(const void * a, const void * b){
        return value[*(int*)a] - value[*(int*)b];
    }

    qsort(index, 10, sizeof(int), cmp);

    for(int i=0; i<10; ++i)
        printf("%d ", value[index[i]]);
    printf("\n");

    return 0;
}