hdu 1880 魔咒词典 (字符串hash)
题意:给你一部魔咒词典。当哈利听到一个魔咒时,你的程序必须告诉他那个魔咒的功能;当哈利需要某个功能但不知道该用什么魔咒时,你的程序要替他找到相应的魔咒。如果他要的魔咒不在词典中,就输出“what?”
思路:hash裸题。。。然而怎么感觉是第一次写hash呢。。。。
/* ***********************************************
Author :111qqz
Created Time :2016年11月20日 星期日 10时27分05秒
File Name :code/hdu/1880.cpp
************************************************ */
1#include <cstdio>
2#include <cstring>
3#include <iostream>
4#include <algorithm>
5#include <vector>
6#include <queue>
7#include <set>
8#include <map>
9#include <string>
10#include <cmath>
11#include <cstdlib>
12#include <ctime>
13#define fst first
14#define sec second
15#define lson l,m,rt<<1
16#define rson m+1,r,rt<<1|1
17#define ms(a,x) memset(a,x,sizeof(a))
18typedef long long LL;
19#define pi pair < int ,int >
20#define MP make_pair
1using namespace std;
2const double eps = 1E-8;
3const int dx4[4]={1,0,0,-1};
4const int dy4[4]={0,-1,1,0};
5const int inf = 0x3f3f3f3f;
6const int N=1E5+7;
7char magic[N][25],fun[N][81];
8int cnt;
9int n;
10map<int,int>mp1,mp2;
11unsigned int BKDRHash(char *str)
12{
13 unsigned int seed = 131;
14 unsigned int hash = 0 ;
15 while (*str) hash = hash*seed+(*str++);
16 return (hash&0x7fffffff);
17}
18int main()
19{
20 #ifndef ONLINE_JUDGE
21 freopen("code/in.txt","r",stdin);
22 #endif
23 cnt = 1 ;
24 while (~scanf("%s",magic[cnt]))
25 {
26 if (strcmp(magic[cnt],"@END@")==0) break;
27 getchar();
28 gets(fun[cnt]);
29 cnt++;
30 }
31 cnt--;
32 for ( int i = 1; i <= cnt ; i++)
33 {
34 mp1[BKDRHash(magic[i])] = i ;
35 mp2[BKDRHash(fun[i])] = i;
36 }
37 scanf("%d",&n);
38 getchar();
39 char tmp[85];
40 while (n--)
41 {
42 gets(tmp);
43 if (tmp[0]=='[')
44 {
1 if (!mp1[BKDRHash(tmp)])
2 {
3 puts("what?");
4 }
5 else
6 {
7 int id = mp1[BKDRHash(tmp)];
8 printf("%s",fun[id]);
9 printf("\n");
10 }
11 }
12 else
13 {
14 if (!mp2[BKDRHash(tmp)])
15 {
16 puts("what?");
17 }
18 else
19 {
20 int id = mp2[BKDRHash(tmp)];
21 int len = strlen(magic[id]);
22 for ( int i = 1 ; i <len -1 ; i++) printf("%c",magic[id][i]);
23 printf("\n");
1 }
2 }
3 ms(tmp,0);
4 }
1 #ifndef ONLINE_JUDGE
2 fclose(stdin);
3 #endif
4 return 0;
5}