题解 | #查找两个字符串a,b中的最长公共子串#
查找两个字符串a,b中的最长公共子串
https://www.nowcoder.com/practice/181a1a71c7574266ad07f9739f791506
import java.util.Scanner;
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
String str_1 = in.nextLine();
String str_2 = in.nextLine();
int len_1 = str_1.length();
int len_2 = str_2.length();
if(len_1 < len_2){
System.out.print(sub(str_1,str_2));
}
else{
System.out.print(sub(str_2,str_1));
}
}
private static String sub(String str_1, String str_2) {
int len_1 = str_1.length();
int len_2 = str_2.length();
int index = 0;
int max = 0;
int[][] dp = new int[len_1 + 1][len_2 + 2];
for (int i = 1; i <= len_1; i++) {
for (int j = 1; j <= len_2; j++) {
if (str_1.charAt(i - 1) == str_2.charAt(j - 1)) {
dp[i][j] = dp[i - 1][j - 1] + 1;
if (dp[i][j] > max) {
max = dp[i][j];
index = i;
}
}
}
}
return str_1.substring(index - max, index);
}
}
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