提出 #7564431

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ソースコード 拡げる

#include <bits/stdc++.h>
 
using namespace std;
typedef long long LL;
typedef pair<int,int> pii;
typedef int ftype;
typedef complex<ftype> point;
 
#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fi first
#define se second 
#define debug(x)  do{cerr<<#x<<": "<<x<<"\n";}while(0)
#define debugv(x) do{cerr<<#x<<": ";for(auto&e: (x))cerr<<e<<" ";cerr<<"\n";}while(0)
#define fori(i, n) for (int i = 0; i < (int)(n); ++i)
#define forn(i, n) for (int i = 1; i <= (int)(n); ++i)
#define ford(i, n) for (int i = (int)(n); i >= 0; --i)
#define fore(i, a, b) for (int i = (int)(a); i <= (int)(b); ++i)
#define RETURN(x) do{cout << x << '\n'; return 0;}while(0)
#define FIRSTWIN do{cout << "Monocarp\n"; return 0;}while(0)
#define SECONDWIN do{cout << "Bicarp\n"; return 0;}while(0)

const int MAXN = 5e3+4;
const int MOD = 1e9+7;

int N;
char S[MAXN];
int z[MAXN];

int ans;
void zfunction(char *s, char *end) {
    int n = end-s;
    for (int i = 0; i < n; i++) z[i] = 0;

    for (int i = 1, l = 0, r = 0; i < n; ++i) {
        if (i <= r)
            z[i] = min (r - i + 1, z[i - l]);
        while (i + z[i] < n && s[z[i]] == s[i + z[i]])
            ++z[i];
        if (i + z[i] - 1 > r)
            l = i, r = i + z[i] - 1;
    }

    for (int i = 1; i < n; ++i) 
        ans = max(ans, min(i, z[i]));
}

int main() {
#ifdef OJ
    freopen("input.txt", "rt", stdin);
    //freopen("output.txt", "wt", stdout);
#endif
    ios::sync_with_stdio(false);
    cin.tie(0);

    cin >> N >> S;
    char *end = S+N;
    for (char *s = S; s+1 != end; s++) 
        zfunction(s,end);

    cout << ans << '\n';
    return 0;
}

提出情報

ジャッジ結果