Submission #1242978

#	Time	Username	Problem	Language	Result	Execution time	Memory
1242978		KindaGoodGames	Horses (IOI15_horses)	C++20	17 / 100	163 ms	20296 KiB

horses

#include<bits/stdc++.h>
#include "horses.h"

using namespace std;
#define pii pair<int,int>
#define int long long

int mod = 1e9+7;

struct SegmentTree{
	int len = 1;
	vector<int> S;
	
	SegmentTree(int n){
		while(len < n) len <<= 1;
		S.resize(2*len, 1);
	}

	int query(int ql, int qr, int l= 0, int r = -2, int i = 1){
		if(r == -2) r = len;
		if(ql <= l && r <= qr) return S[i];
		if(r <= ql || qr <= l) return 1;

		int mid = (l+r)/2;
		return (query(ql,qr,l,mid,i*2) * query(ql,qr,mid,r,i*2+1)) % mod;
	}

	void upd(int i, int v){
		i += len;
		S[i] = v;

		for(i /= 2; i > 0; i /= 2){
			S[i] = (S[i*2] * S[i*2+1])% mod;
		}
	}
};

int32_t init(int32_t n, int32_t mult[], int32_t cost[]) {
	vector<int> X(n);
	vector<int> Y(n);
	for(int i = 0; i < n; i++){
		X[i] = mult[i];
		Y[i] = cost[i];
	}
	
	SegmentTree seg(n);

	for(int i = 0;i < n; i++){
		seg.upd(i, X[i]);
	}

	queue<pii> S;
	S.push({0, X[0]});

	for(int i = 1; i < n; i++){
		int ncnt = 0;

		while(S.size()){
			int ind, sz;
			tie(ind,sz) = S.front();
			int c = Y[ind];
			int amt = seg.query(ind+1, i+1);
			int nc = (amt) * Y[i];

			if(c <= nc){
				ncnt += (sz*amt);
				S.pop();
			}else{
				break;
			}
		}

		S.push({i,ncnt});
	}

	int r = 0;
	while(S.size()){
		r += Y[S.front().first] * S.front().second; 
		S.pop();
	}
	return r;
}

int32_t updateX(int32_t pos, int32_t val) {	
	return 0;
}

int32_t updateY(int32_t pos, int32_t val) {
	return 0;
}

• Subtask 1: 17 / 17
• Subtask 2: 0 / 17
• Subtask 3: 0 / 20
• Subtask 4: 0 / 23
• Subtask 5: 0 / 23