最长公共子序列II.打印出最长公共子序列

Posted 2022-04-26 programyang

#include<stdio.h>
#include<string.h>
#include<stack>
#include<algorithm>
using namespace std;
#define N 1010
int dp[N][N];
char c;
int main()

    char a[N];
    char b[N];
    scanf("%s%s",a,b);
    int la=strlen(a);
    int lb=strlen(b);
    memset(dp,0,sizeof(dp));
    for(int i=1; i<=la; i++)
    
        for(int j=1; j<=lb; j++)
        
            if(a[i-1]==b[j-1])
                dp[i][j]=dp[i-1][j-1]+1;
            else
                dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
        
    
    int i=la,j=lb;
    stack<char>s;
    while(dp[i][j])
    
        if(dp[i][j]==dp[i-1][j])
        
            i--;
        
        else if(dp[i][j]==dp[i][j-1])
        
            j--;
        
        else if(dp[i][j]>dp[i-1][j-1])
        
            i--;
            j--;
            s.push(a[i]);
        
    
    while(!s.empty())
    
        c=s.top();
        printf("%c",c);
        s.pop();
    
    return 0;