Submission #88923

#	Time	Username	Problem	Language	Result	Execution time	Memory
88923		jasony123123	Poklon (COCI17_poklon)	C++11	140 / 140	399 ms	22572 KiB

poklon

#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")
#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
#include <unordered_map>
//#include <ext/pb_ds/tree_policy.hpp>
//#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
//using namespace __gnu_pbds;
#define FOR(i,start,end) for(int i=start;i<(int)(end);i++)
#define FORE(i,start,end) for(int i=start;i<=(int)end;i++)
#define RFOR(i,start,end) for(int i = start; i>end; i--)
#define RFORE(i,start,end) for(int i = start; i>=end; i--)
#define all(a) a.begin(), a.end()
#define mt make_tuple
#define v vector
#define sf scanf
#define pf printf
#define dvar(x) cout << #x << " := " << x << "\n"
#define darr(x,n) FOR(i,0,n) cout << #x << "[" << i << "]" << " := " << x[i] << "\n"
typedef long long ll;
typedef long double ld;
typedef pair<int, int > pii;
typedef pair<ll, ll> pll;
//template <class T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<class T> void minn(T &a, T b) { a = min(a, b); }
template<class T> void maxx(T &a, T b) { a = max(a, b); }
inline void io() {
#ifdef LOCAL_PROJECT 
	freopen("input.in", "r", stdin); freopen("output.out", "w", stdout);
#else 
	/* online submission */
#endif 
	ios_base::sync_with_stdio(false); cin.tie(NULL);
}
/**************************COCI 2016-2017 R5 P4 (Alt)*************************/

struct Query {
	int l, r, idx;
	pii ord;
	inline void calcOrder() {
		ord = { l, r };
	}
};
inline bool operator<(const Query &a, const Query &b) {
	return a.ord < b.ord;
}

const int MAXN = 500000;
int N, M, Q, A[MAXN], nxt[MAXN], lastSeen[MAXN];
Query qs[MAXN];
int ans[MAXN];

int L = 0;
int bit[MAXN + 1];
void update(int k, int val) {
	for (k++; k <= N; k += (k&-k))
		bit[k] += val;
}
int query(int k) {
	int temp = 0;
	for (k++; k > 0; k -= (k&-k))
		temp += bit[k];
	return temp;
}
int query(int l, int r) {
	return query(r) - query(l - 1);
}


void init() {
	FOR(i, 0, M) {
		int cur = lastSeen[i];
		int cnt = 0;
		while (cnt<3 && cur != -1) {
			if (cnt == 0) update(cur, 0);
			else if (cnt == 1) update(cur, 1);
			else update(cur, -1);
			cnt++;
			cur = nxt[cur];
		}
	}
}
void remove(int cur) {
	cur = nxt[cur];
	int cnt = 0;
	while (cnt<3 && cur != -1) {
		if (cnt == 0) update(cur, -1);
		else if (cnt == 1) update(cur, 2);
		else update(cur, -1);
		cnt++;
		cur = nxt[cur];
	}
}


void calcNext() {
	fill(lastSeen, lastSeen + N, -1);
	RFORE(i, N - 1, 0) {
		nxt[i] = lastSeen[A[i]];
		lastSeen[A[i]] = i;
	}
}

void compress(int a[], int n) {
	v<int> dat;
	FOR(i, 0, n) dat.emplace_back(a[i]);
	sort(dat.begin(), dat.end());
	dat.erase(unique(dat.begin(), dat.end()), dat.end());
	FOR(i, 0, n)
		a[i] = lower_bound(all(dat), a[i]) - dat.begin();
	M = dat.size();
}

int main() {
	io();
	cin >> N >> Q;
	FOR(i, 0, N) cin >> A[i];
	compress(A, N);
	calcNext();
	FOR(i, 0, Q) {
		cin >> qs[i].l >> qs[i].r;
		qs[i].l--, qs[i].r--;
		qs[i].idx = i;
		qs[i].calcOrder();
	}
	sort(qs, qs + Q);
	
	init();
	FOR(i, 0, Q) {
		auto q = qs[i];
		while (L < q.l)
			remove(L++);
		ans[q.idx] = query(q.l, q.r);
	}
	
	FOR(i, 0, Q) cout << ans[i] << "\n";
	return 0;
}

• Subtask 1: 140 / 140