Submission #849274

#	Time	Username	Problem	Language	Result	Execution time	Memory
849274		IBory	역사적 조사 (JOI14_historical)	C++17	100 / 100	3417 ms	14164 KiB

historic

#include <bits/stdc++.h>
#define pii pair<ll, ll>
typedef long long ll;
using namespace std;

const int SZ = 1 << 17, SQ = 8;
ll X[SZ], ans[SZ], S[SZ];

struct Query {
	int s, e, id;
	Query(int a = 0, int b = 0, int c = 0) {
		s = a, e = b, id = c;
	}
	const bool operator<(Query& a) {
		if ((s >> SQ) != (a.s >> SQ)) return (s >> SQ) < (a.s >> SQ);
		return e > a.e;
	}
} QS[SZ];

struct Seg {
	ll T[SZ << 1];
	void Update(int i, ll v) {
		T[i += SZ - 1] += v;
		while (i >>= 1) T[i] = max(T[i * 2], T[i * 2 + 1]);
	}
} T;

void Add(int idx) {
	T.Update(S[idx], X[idx]);
}

void Sub(int idx) {
	T.Update(S[idx], -X[idx]);
}

int main() {
	ios::sync_with_stdio(0); cin.tie(0);
	int N, Q;
	cin >> N >> Q;
	map<int, int> occur;
	for (int i = 1; i <= N; ++i) {
		cin >> X[i];
		if (occur.find(X[i]) == occur.end()) S[i] = occur[X[i]] = i;
		else S[i] = occur[X[i]];
	}
	for (int i = 0; i < Q; ++i) {
		int s, e;
		cin >> s >> e;
		QS[i] = Query(s, e, i);
	}
	sort(QS, QS + Q);

	int L = 1, R = 0;
	for (int d = 0; d < Q; ++d) {
		auto [s, e, id] = QS[d];
		while (R < e) Add(++R);
		while (s < L) Add(--L);
		while (e < R) Sub(R--);
		while (L < s) Sub(L++);
		ans[id] = T.T[1];
	}

	for (int i = 0; i < Q; ++i) cout << ans[i] << '\n';
	return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 25 / 25
• Subtask 4: 60 / 60