九度笔记之 1468：Sharing

题目1468：Sharing

求两个单词的共同后缀具体参见

http://ac.jobdu.com/problem.php?pid=1468

算法分析

     把两个单词右对齐，然后从短的单词开始和长的单词的对应位置进行比较
如下两个单词，loading的长度为7，ending的长度为6，
则loading从第2个位置开始，ending从第1个位置开始依次比较。
    L o a d i n g
       e n d i n g

需要注意的是
1.输入格式 printf("%05d\n",one);
2.将长单词的起始开始位置向右移动dis位，然后逐对比较。 dis为长单词的长度和短单词长度的差

while(dis>0){
one = toAdr[one];
dis--;
}

while(one!=two){
one = toAdr[one];
two = toAdr[two];
}

源程序

// Name        : judo1468.cpp
// Author      : wdy
// Version     :
// Copyright   : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================
 
#include <iostream>
#include <stdio.h>
#include <cstring>
using namespace std;
int toAdr[100001] = {0};
void init(int N){
    memset(toAdr,0,sizeof(toAdr));
 
    int from;
    char c;
    int to;
    for(int i = 0;i<N;i++){
        scanf("%d %c %d",&from,&c,&to);
        toAdr[from] = to;
    }
 
}
int getLength(int beg){
    int from = beg;
    int len=1;
    while(toAdr[from]>0){
        len++;
        from = toAdr[from];
    }
    return len;
}
void findSuffix(int  longWord,int shortWord,int dis){
    int one = longWord;
    int two = shortWord;
    while(dis>0){
        one = toAdr[one];
        dis--;
    }
 
    while(one!=two){
        one = toAdr[one];
        two = toAdr[two];
    }
    if(one==-1)
        printf("-1\n");
    else
        printf("%05d\n",one);//ATTENTION
}
void judge(int begone,int begtwo,int n){
    init(n);
    int len1 = getLength(begone);
    int len2 = getLength(begtwo);
    //std::cout<<"len1"<<getLength(begone);
    //std::cout<<"   len2"<<getLength(begtwo)<<std::endl;
 
    if(len1>len2){
        findSuffix(begone,begtwo,len1-len2);
    }else{
        findSuffix(begtwo,begone,len2-len1);
    }
}
void judo(){
    int one;
    int two;
    int n;
    while(std::cin>>one>>two>>n){
        judge(one, two, n);
    }
}
int main() {
    //cout << "!!!Hello World!!!" << endl; // prints !!!Hello World!!!
    judo();
    return 0;
}
/**************************************************************
    Problem: 1468
    User: KES
    Language: C++
    Result: Accepted
    Time:190 ms
    Memory:1908 kb
****************************************************************/