洛谷P1481 魔族密码(LIS)

题意

题目链接

给出一堆字符串，若一个串是另一个串的前缀 ，那么它们可以连接在一起

问最大的链接长度

Sol

LIS沙比提其实是做完了才看出是LIS

#include<cstdio>
#include<algorithm>
#include<cstring>
#include<iostream>
#define LL long long
// #define int long long  
using namespace std;
const int MAXN = 2001, INF = 1e9 + 7, mod = 998244353;
inline int read() {
    char c = getchar(); int x = 0, f = 1;
    while(c < '0' || c > '9') {if(c == '-') f = -1; c = getchar();}
    while(c >= '0' && c <= '9') x = x * 10 + c - '0', c = getchar();
    return x * f;
}
int N;
string s[MAXN];
int f[MAXN];
bool suf(string a, string b) {
    int cur = 0;
    for(int i = 0; i < a.length(); i++) {
        if(a[i] != b[cur]) return 0;
        cur++;
    }
    return 1;
}
main() {
    cin >> N;
    for(int i = 1; i <= N; i++) cin >> s[i];
    int ans = 0;
    for(int i = 1; i <= N; i++) {
        f[i] = 1;
        for(int j = 1; j < i; j++) {
            if(suf(s[j], s[i])) f[i] = max(f[i], f[j] + 1);
        }
        ans = max(ans, f[i]);
    }
    printf("%d", ans);
    return 0;
}
/*
*/