c_cpp 打印最长的公共子字符串

Posted 2021-05-14

//https://www.geeksforgeeks.org/print-longest-common-substring/
#include <bits/stdc++.h>
using namespace std;

void func(string s, string t) {
    int n=s.length(), m= t.length();
    int dp[n+1][m+1];

    int ans=INT_MIN, r,c;

    for (int i=0;i<=n;i++) {
        for (int j=0;j<=m;j++) {
            if (i==0 || j==0)
                dp[i][j]=0;
            else if (s[i]==t[j]) {
                dp[i][j]= 1+ dp[i-1][j-1];
                if (ans < dp[i][j]) {
                    ans= dp[i][j];
                    r= i;
                    c= j;
                }
            }
            else
                dp[i][j]= 0;
        }
    }
    cout<< "Length of LCS: "<< ans;
    string str;
    while (dp[r][c]!=0) {
        str+= s[r];
        r--;
        c--;
    }
    reverse(str.begin(), str.end());
    cout<<"\nLCS is: "<< str;
}

int main() {
    string s= "OldSite:GeeksforGeeks.org";
    string t= "NewSite:GeeksQuiz.com";

    func(s,t);
}