AcWing 897. 最长公共子序列

#include <iostream>
#include <algorithm>
using namespace std;
const int N = ;
int n, m;
char a[N], b[N];
int f[N][N];
int main() {
    scanf("%d%d", &n, &m);
    scanf("%s%s", a + , b + );
    for (int i = ; i <= n; i ++ )
        for (int j = ; j <= m; j ++ ) {
            f[i][j] = max(f[i - ][j], f[i][j - ]);//看一下第i和第j个字母有没有出现
            //i-1，j-1 是包含在上面两种情况中的
            if (a[i] == b[j]) f[i][j] = max(f[i][j], f[i - ][j - ] + );
        }
    printf("%d\n", f[n][m]);
    return ;
}