最长上升子序列

#include<iostream>
#include<cstring>
#include<algorithm>
#include<cstdio>
using namespace std;
int dp[1010][1010];
char list[1010];
char ans[1010];
int main() {
	while (~scanf("%s %s", list, ans)) {
		int len1 = strlen(list);
		int len2 = strlen(ans);
		memset(dp, 0, sizeof(dp));

		for (int i = 1; i <= len1; i++) {
			for (int j = 1; j <= len2; j++) {
				if (ans[j - 1] == list[i - 1]) {
					dp[i][j] = dp[i - 1][j - 1] + 1;
				}
				else {
					dp[i][j] = max(dp[i][j - 1], dp[i - 1][j]);
				}
			}
		}
		cout << dp[len1][len2] << endl;
	}
	return 0;
}