Substrings

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 13779    Accepted Submission(s):
6689

http://acm.hdu.edu.cn/showproblem.php?pid=1238

Problem Description

You are given a number of case-sensitive strings of
alphabetic characters, find the largest string X, such that either X, or its
inverse can be found as a substring of any of the given strings.

Input

The first line of the input file contains a single
integer t (1 <= t <= 10), the number of test cases, followed by the input
data for each test case. The first line of each test case contains a single
integer n (1 <= n <= 100), the number of given strings, followed by n
lines, each representing one string of minimum length 1 and maximum length 100.
There is no extra white space before and after a string.

Output

There should be one line per test case containing the
length of the largest string found.

Sample Input

2
3
ABCD
BCDFF
BRCD
2
rose
orchid

Sample Output

2 2

#include<cstdio>
#include<cstring>
#include<algorithm>
#include<iostream>
using namespace std;
const int maxn=100+3;
char str[maxn];
string ansstr,ss;
string str2[maxn];
int t,n;
int main(){
    scanf("%d",&t);
    while(t--){
        scanf("%d",&n);
        for(int i=0;i<n;i++){
            scanf("%s",str);
            str2[i]=str;
        }
        string temp=str2[0];
        int len=temp.size();
        int ans=0;
        for(int i=0;i<len;i++){
            for(int j=1;j+i<=len;j++){
                int cnt=1;
                ss=temp.substr(i,j);
                for(int k=1;k<n;k++){
                    if(str2[k].find(ss)!=-1){
                        cnt++;
                    }
                }
                if(cnt==n){
                    if(ans<j){
                        ans=j;
                        ansstr=ss;
                    }else if(ans==j){
                        ansstr=min(ansstr,ss);
                    }
                }
            }
        }
        reverse(temp.begin(),temp.end());
        for(int i=0;i<len;i++){
            for(int j=1;j+i<=len;j++){
                int cnt=1;
                ss=temp.substr(i,j);
                for(int k=1;k<n;k++){
                    if(str2[k].find(ss)!=-1){
                        cnt++;
                    }
                }
                if(cnt==n){
                    if(ans<j){
                        ans=j;
                        ansstr=ss;
                    }else if(ans==j){
                        ansstr=min(ansstr,ss);
                    }
                }
            }
        }
        printf("%d\n",ans);
    }
}

#include<stdio.h>//网上大佬的代码
#include<algorithm>
#include<iostream>
#include<string.h>
using namespace std;

const int maxn = 105;
char str[maxn];
string ansstr;
string str2[maxn];

int main()
{
    int n,t;
    scanf("%d",&t);
    while(t--)
    {
        scanf("%d",&n);
        for(int i=0;i<n;i++)
        {
            scanf("%s",str);
            str2[i]=str;
        }
        int ans=0;
        string tmp=str2[0];
        int tmplen=tmp.size();
        for(int i=0;i<tmplen;i++)
        {
            for(int j=1;i+j<=tmplen;j++)
            {
                int cnt=1;
                string ss=tmp.substr(i,j);
                for(int k=1;k<n;k++)
                {
                    if(str2[k].find(ss)!=-1)
                        cnt++;
                }
                if(cnt==n)
                {
                    if(ans<j)
                    {
                        ans=j;
                        ansstr=ss;
                    }
                    else if(ans==j)
                    {
                        ansstr=min(ansstr,ss);
                    }
                }
            }
        }
        reverse(tmp.begin(),tmp.end());//reverse()会将区间[beg,end)内的元素全部逆序；
        for(int i=0;i<tmplen;i++)
        {
            for(int j=1;i+j<=tmplen;j++)
            {
                int cnt=1;
                string ss=tmp.substr(i,j);
                for(int k=1;k<n;k++)
                {
                    if(str2[k].find(ss)!=-1)
                        cnt++;
                }
                if(cnt==n)
                {
                  //  cout<<ss<<" "<<cnt<<endl;
                    if(ans<j)
                    {
                        ans=j;
                        ansstr=ss;
                    }
                    else if(ans==j)
                    {
                        ansstr=min(ansstr,ss);
                    }
                }
            }
        }
        printf("%d\n",ans);
    }
}

原文地址：https://www.cnblogs.com/qqshiacm/p/11599482.html