Fafu 1266 数数(hash应用)

http://acm.fafu.edu.cn/problem.php?id=1266

把2^31范围内的数 %10000求得真hash值

把值存到hash链表中

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

struct node{
	int val;
	node * next;
}hash[10000];


int main()
{
	freopen("E:\\input.txt", "r", stdin);
	int n;
	while(scanf("%d", &n) != EOF)
	{
		memset(hash, 0, sizeof(hash));
		int hashVal;
		while(n--)
		{
			int v;
			scanf("%d", &v);
			hashVal = v%10000;

			node * last = hash[hashVal].next; //save
			hash[hashVal].next = new node;
			hash[hashVal].next->val = v;
			hash[hashVal].next->next = last;
		}

		int m;
		scanf("%d", &m);
		while(m--)
		{
			int query;
			scanf("%d", &query);
			hashVal = query % 10000;
			node * pointer = hash[hashVal].next;

			int times = 0;
			while(pointer != NULL)
			{
				if(pointer->val == query)
					times++;

				pointer = pointer->next;
			}

			if(m != 0)
				printf("%d ", times);
			else
				printf("%d\n", times);
		}
	}
	return 0;
}