hdu 2141 Can you find it? 二分

 

/*
 * hdu2141.c
 *
 *  Created on: 2011-10-9
 *      Author: bjfuwangzhu
 */

#include<stdio.h>
#include<stdlib.h>
#define nmax 5001
#define nnum 250001
#define LL long long
LL numL[nmax], numN[nmax], numM[nmax], numLN[nnum];
int cmp(const void *a, const void *b) {
    LL temp = *(LL *) a - *(LL *) b;
    if (temp > 0) {
        return 1;
    } else if (temp < 0) {
        return -1;
    }
    return 0;
}
int Mbsearch(LL key, int n) {
    int left, right, mid;
    left = 0, right = n;
    while (left <= right) {
        mid = (left + right) >> 1;
        if (numLN[mid] == key) {
            return 1;
        } else if (numLN[mid] > key) {
            right = mid - 1;
        } else {
            left = mid + 1;
        }
    }
    return 0;
}
int main() {
#ifndef ONLINE_JUDGE
    freopen("data.in", "r", stdin);
#endif
    int L, N, M, S, i, j, k, cas;
    LL X;
    cas = 0;
    while (~scanf("%d %d %d", &L, &N, &M)) {
        for (i = 0; i < L; i++) {
            scanf("%I64d", numL + i);
        }
        for (i = 0; i < N; i++) {
            scanf("%I64d", numN + i);
        }
        for (i = 0; i < M; i++) {
            scanf("%I64d", numM + i);
        }
        for (i = 0, k = 0; i < L; i++) {
            for (j = 0; j < N; j++) {
                numLN[k++] = numL[i] + numN[j];
            }
        }
        qsort(numLN, k, sizeof(numLN[0]), cmp);
        qsort(numM, M, sizeof(numM[0]), cmp);
        scanf("%d", &S);
        printf("Case %d:\n", ++cas);
        for (i = 0; i < S; i++) {
            scanf("%I64d", &X);
            if (X < numLN[0] + numM[0] || X > numLN[k - 1] + numM[M - 1]) {
                puts("NO");
            } else {
                for (j = 0; j < M; j++) {
                    if (Mbsearch(X - numM[j], k)) {
                        puts("YES");
                        break;
                    }
                }
                if (j == M) {
                    puts("NO");
                }
            }
        }

    }
    return 0;
}