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魔咒词典

Time Limit: 8000/5000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 14661 Accepted Submission(s): 3528

Problem Description
哈利波特在魔法学校的必修课之一就是学习魔咒。据说魔法世界有100000种不同的魔咒,哈利很难全部记住,但是为了对抗强敌,他必须在危急时刻能够调用任何一个需要的魔咒,所以他需要你的帮助。

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?”

Input
首先列出词典中不超过100000条不同的魔咒词条,每条格式为:

[魔咒] 对应功能

其中“魔咒”和“对应功能”分别为长度不超过20和80的字符串,字符串中保证不包含字符“[”和“]”,且“]”和后面的字符串之间有且仅有一个空格。词典最后一行以“@END@”结束,这一行不属于词典中的词条。
词典之后的一行包含正整数N(<=1000),随后是N个测试用例。每个测试用例占一行,或者给出“[魔咒]”,或者给出“对应功能”。

Output
每个测试用例的输出占一行,输出魔咒对应的功能,或者功能对应的魔咒。如果魔咒不在词典中,就输出“what?”

Sample Input
[expelliarmus] the disarming charm
[rictusempra] send a jet of silver light to hit the enemy
[tarantallegra] control the movement of one’s legs
[serpensortia] shoot a snake out of the end of one’s wand
[lumos] light the wand
[obliviate] the memory charm
[expecto patronum] send a Patronus to the dementors
[accio] the summoning charm
@END@
4
[lumos]
the summoning charm
[arha]
take me to the sky

Sample Output
light the wand
accio
what?
what?

Author
ZJU

Source
浙大计算机研究生复试上机考试-2008年

字符串Hash

#include <stdio.h>#include <algorithm>#include <string.h>#include <math.h>#define MAXN 100010#define mod 100007#define inf 0x7fffffffstruct node{    char s1[30];    char s2[90];    int next;}nodeA[MAXN],nodeB[MAXN];int curA,curB;int hashTableA[MAXN],hashTableB[MAXN];void initHash(){    memset(hashTableB,-1,sizeof(hashTableB));    memset(hashTableA,-1,sizeof(hashTableA));    curA = 0;    curB = 0;}int getHash(char *s){    int seed = 131;    int hash = 0;    while(*s)    {        hash = hash*seed + *s++;    }    return (hash & inf) % mod;}void insertHash(char *s1, char *s2){    int h;    h = getHash(s1);    strcpy(nodeA[curA].s1,s1);    strcpy(nodeA[curA].s2,s2);    nodeA[curA].next = hashTableA[h];    hashTableA[h] = curA;    curA++;    h = getHash(s2);    strcpy(nodeB[curB].s1,s1);    strcpy(nodeB[curB].s2,s2);    nodeB[curB].next = hashTableB[h];    hashTableB[h] = curB;    curB++;}int searchHashA(char *s){    int h = getHash(s);    int next = hashTableA[h];    while(next != -1)    {        if(strcmp(s,nodeA[next].s1) == 0) return next;        next = nodeA[next].next;    }    return -1;}int serchHashB(char *s){    int h = getHash(s);    int next = hashTableB[h];    while(next != -1)    {        if(strcmp(s,nodeB[next].s2) == 0) return next;        next = nodeB[next].next;    }    return -1;}int main(){    initHash();    char str[105];    char s1[30],s2[90];    while(gets(str))    {        if (str[0] == '@') break;        int p1 = 0,p2 = 0;        int len = strlen(str);        if(str[0] == '[')        {            for(int i = 1; str[i] != ']'; i++)            {                s1[p1++] = str[i];            }            s1[p1] = 0;            for(int i = p1+3; str[i] != 0; i++)            {                s2[p2++] = str[i];            }            s2[p2] = 0;            insertHash(s1,s2);        }    }    int n;    char ss[90];    scanf("%d\n",&n);    int ans;    for(int i = 0; i < n; i++)    {        gets(ss);        int hss = strlen(ss);        if(ss[0] == '[')        {            ss[hss-1] = 0;            ans = searchHashA(ss+1);            if(ans == -1) printf("what?\n");            else          printf("%s\n",nodeA[ans].s2);        }        else        {            ans = serchHashB(ss);            if(ans == -1) printf("what?\n");            else          printf("%s\n",nodeB[ans].s1);        }    }}