题目链接：http://www.patest.cn/contests/pat-a-practise/1032
题目：
1032. Sharing (25)
To store English words, one method is to use linked lists and store a word letter by letter. To save some space, we may let the words share the same sublist if they share the same suffix. For example, "loading" and "being" are stored as showed in Figure 1.
Figure 1
You are supposed to find the starting position of the common suffix (e.g. the position of "i" in Figure 1).
Input Specification:
Each input file contains one test case. For each case, the first line contains two addresses of nodes and a positive N (<= 105), where the two addresses are the addresses of the first nodes of the two words, and N is the total number of nodes. The address of a node is a 5-digit positive integer, and NULL is represented by -1.
Then N lines follow, each describes a node in the format:
Address Data Next
where Address is the position of the node, Data is the letter contained by this node which is an English letter chosen from {a-z, A-Z}, andNext is the position of the next node.
Output Specification:
For each case, simply output the 5-digit starting position of the common suffix. If the two words have no common suffix, output "-1" instead.
Sample Input 1:11111 22222 9 67890 i 00002 00010 a 12345 00003 g -1 12345 D 67890 00002 n 00003 22222 B 23456 11111 L 00001 23456 e 67890 00001 o 00010Sample Output 1:
67890Sample Input 2:
00001 00002 4 00001 a 10001 10001 s -1 00002 a 10002 10002 t -1Sample Output 2:
-1
分析：
两个链表。找到它们相交的第一个节点。
注意：
可能存在多个字串。而且可能有其它非题目中两字串的节点存在。而且注意最后是要输出%05d的
AC代码：
#include<stdio.h>
#include<algorithm>
#include<string.h>
using namespace std;
int nodes[100001];
int real_nodes[100001];
int main(void){
//freopen("F://Temp/input.txt", "r", stdin);
int s1, s2, n;
scanf("%d %d %d", &s1, &s2, &n);
int s, t;
char c;
for (int i = 0; i < 100001; i++){
nodes[i] = 0;
real_nodes[i] = 0;
}
for (int i = 0; i < n; i++){
scanf("%d %c %d", &s, &c, &t);
nodes[s] = t;
}
int start = s1; int end;
while (start != -1){
real_nodes[start] = 1;
start = nodes[start];
}//找到第一个链表的全部节点，并置为1
start = s2;
bool find = false;
while (start != -1){
if (real_nodes[start] != 0){//假设第二个链表中地址已经有记录，则就是第一个公共节点
printf("%.5d
", start);
return 0;
}
else {
real_nodes[start] = nodes[start];
start = nodes[start];
}
}
puts("-1");
return 0;
}截图：
——Apie陈小旭