PAT (Advanced level) 1077. Kuchiguse (20) 最长共同后缀

The Japanese language is notorious for its sentence ending particles. Personal preference of such particles can be considered as a reflection of the speaker's personality. Such a preference is called "Kuchiguse" and is often exaggerated artistically in Anime and Manga. For example, the artificial sentence ending particle "nyan~" is often used as a stereotype for characters with a cat-like personality:

Itai nyan~ (It hurts, nyan~)

Ninjin wa iyada nyan~ (I hate carrots, nyan~)

Now given a few lines spoken by the same character, can you find her Kuchiguse?

Input Specification:

Each input file contains one test case. For each case, the first line is an integer N (2<=N<=100). Following are N file lines of 0~256 (inclusive) characters in length, each representing a character's spoken line. The spoken lines are case sensitive.

Output Specification:

For each test case, print in one line the kuchiguse of the character, i.e., the longest common suffix of all N lines. If there is no such suffix, write "nai".

Sample Input 1:

3Itai nyan~Ninjin wa iyadanyan~uhhh nyan~

Sample Output 1:

nyan~

Sample Input 2:

3Itai!Ninjinnwaiyada T_TT_T

Sample Output 2:

nai

从后往前遍历。

/*2015.7.29cyq*/#include <iostream>#include <string>#include <vector>#include <fstream>#include <cstring>using namespace std;//ifstream fin("case1.txt");//#define cin finint main(){int N;cin>>N;string enter;getline(cin,enter);//去掉第一行的回车vector<string> svec(N);vector<int> len(N);for(int i=0;i<N;i++){getline(cin,svec[i]);len[i]=svec[i].size();}int count=0;bool flag;for(int i=1;i<=len[0];i++){flag=true;for(int j=1;j<N;j++){//第二个string及之后的stringif(len[j]<i||svec[j][len[j]-i]!=svec[0][len[0]-i]){flag=false;break;}}if(!flag)break;count++;}if(count==0)cout<<"nai";elsecout<<svec[0].substr(len[0]-count);return 0;}