HDU1238-Substrings
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Substrings
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 9866 Accepted Submission(s): 4679
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
23ABCDBCDFFBRCD2roseorchid
Sample Output
22
Author
Asia 2002, Tehran (Iran), Preliminary
题思:找出所有字符串中共同拥有的一个子串,该子串(正、逆字符)是任何一个母串的子串,求该子串的最长长度。
#include <iostream>#include <cstdio>#include <cstring>#include <stack>#include <queue>#include <cmath>#include <algorithm>using namespace std;const int INF=0x3f3f3f3f;int main(){ int t,n; char str[105][105],s1[105],s2[105]; scanf("%d",&t); while(t--) { scanf("%d",&n); int mi=INF,p; for(int i=0; i<n; i++) { scanf("%s",str[i]); int len=strlen(str[i]); if(mi>len) { mi=len; p=i; } } int len1=strlen(str[p]); int flag=1; int ma=0; for(int i=0;i<len1;i++) { for(int j=i;j<len1;j++) { flag=1; for(int k=i;k<=j;k++) { s1[k-i]=str[p][k]; s2[j-k]=str[p][k]; } s1[j-i+1]=s2[j-i+1]='\0'; int len2=strlen(s1); for(int k=0; k<n; k++) { if(!strstr(str[k],s1)&&!strstr(str[k],s2)) { flag=0; break; } } if(len2>ma&&flag) ma=len2; } } printf("%d\n",ma); } return 0;}
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