Submission #660473

#	Time	Username	Problem	Language	Result	Execution time	Memory
660473		thanh913	Nivelle (COCI20_nivelle)	C++14	110 / 110	150 ms	9044 KiB

nivelle

#pragma GCC target("popcnt")
#include <bits/stdc++.h>
using namespace std;

//types
#define ll long long
#define ld long double
#define pll pair<ll, ll>
#define pii pair<int, int>

#define fi first
#define se second
#define inf 0x3f3f3f3f

#define pw2(x) (1LL << (x))
#define getBit(x, y) ((x) & (1LL << (y)))

template<class X, class Y>
bool cmax(X &a, const Y &b) {
    return a < b ? a = b, 1 : 0;
}

template<class X, class Y>
bool cmin(X &a, const Y &b) {
    return a > b ? a = b, 1 : 0;
}

struct Answer {
    ll l, r, first, second;
    Answer(ll _l = 0, ll _r = 0, ll _first = 0, ll _second = 0) {
        l = _l; r = _r; first = _first; second = _second;
    }
};

//lowercase 31, all 53
//(P/Q) % M = (P % M) * (Q^(M-2) % M)
//-------------------------------------------------------

const ld PI = 3.14159265359;
const ll N = 1e5+5, L = 18, mod = 1e9+7;
int n, a[N];

int lg[N], st[N][L+2];

int get(int l, int r) {
    int j = lg[r - l + 1];
    return __builtin_popcount(st[l][j] | st[r - (1 << j) + 1][j]);
}

Answer ans(0, 0, inf, 1);

Answer comp(Answer x, Answer y) {
    Answer t1 = x, t2 = y;
    x.fi *= y.se; y.fi *= x.se;
    x.se = y.se = x.se * y.se;
    if (x.fi <= y.fi) return t1;
    return t2;
}

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    cin >> n;
    for (int i = 1; i <= n; i++) {
        char tmp; cin >> tmp; a[i] = 'z' - tmp;
        st[i][0] = (1 << a[i]);
    }
    for (int i = 2; i <= n; i++)
        lg[i] = lg[i/2] + 1;
    for (int j = 1; j <= L; j++) {
        for (int i = 1; i <= n - (1 << j) + 1; i++) {
            st[i][j] = st[i][j-1] | st[i + (1 << (j-1))][j-1];
        }
    }
    for (int cnt = 1; cnt <= 26; cnt++) {
        for (int i = 1; i <= n; i++) {
            int l = i, r = n, kq = -1;
            while (l <= r) {
                int mid = (l+r) / 2;
                if (get(i, mid) <= cnt) {
                    kq = mid;
                    l = mid + 1;
                }
                else r = mid - 1;
            }
            if (kq != -1 && get(i, kq) == cnt) {
                ans = comp(ans, Answer(i, kq, cnt, kq-i+1));
            }
        }
    }
    cout << ans.l << " " << ans.r;
}

• Subtask 1: 7 / 7
• Subtask 2: 17 / 17
• Subtask 3: 13 / 13
• Subtask 4: 25 / 25
• Subtask 5: 48 / 48