【poj解题】3664

简单，两次排序

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

#define MAX 50000

struct Vote {
    int index;
    int a;
    int b;
};

struct Vote candidates[MAX];
int N, K;

int cmp_1(const void * a, const void * b) {
    return ((struct Vote *)b)->a - ((struct Vote *)a)->a;
}
int cmp_2(const void * a, const void * b) {
    return ((struct Vote *)b)->b - ((struct Vote *)a)->b;
}

int pick() {
    qsort(candidates, N, sizeof(candidates[0]), cmp_1);
    qsort(candidates, K, sizeof(candidates[0]), cmp_2);
    return candidates[0].index;
}

int main() {
    int i;
    int res; 

    scanf("%d%d", &N, &K);
    for(i = 0; i < N; i++) {
        scanf("%d%d", &candidates[i].a, &candidates[i].b);
        candidates[i].index = i + 1;
    }

    res = pick();
    printf("%d\n", res);
    return 0;
}