Submission #1172655

#	Time	Username	Problem	Language	Result	Execution time	Memory
1172655		HappyCapybara	Horses (IOI15_horses)	C++17	37 / 100	233 ms	40452 KiB

horses

#include "horses.h"
#include<bits/stdc++.h>
using namespace std;

#define ll __int128

ll m = 1000000007;
int n;
vector<int> x, y;
vector<ll> st;

void update(int pos, int val, int node=1, int tl=0, int tr=n-1){
	if (tl == tr){
		st[node] = val;
		return;
	}
	int tm = (tl+tr)/2;
	if (pos <= tm) update(pos, val, node*2, tl, tm);
	else update(pos, val, node*2+1, tm+1, tr);
	st[node] = (st[node*2]*st[node*2+1]) % m;
}

ll query(int l, int r, int node=1, int tl=0, int tr=n-1){
	if (l <= tl && tr <= r) return st[node];
	int tm = (tl+tr)/2;
	ll res = 1;
	if (l <= tm) res = (res*query(l, r, node*2, tl, tm)) % m;
	if (tm+1 <= r) res = (res*query(l, r, node*2+1, tm+1, tr)) % m;
	return res;
}

int solve(){
	int z = max(0, n-35);
	ll cur = query(0, z), cy = y[z], cx = 1, bsf = (query(0, z)*y[z])%m;
	for (int i=z+1; i<n; i++){
		cur = (cur*x[i]) % m;
		cx *= x[i];
		if (cx * y[i] > cy){
			bsf = (cur*y[i]) % m;
			cy = y[i];
			cx = 1;
		}
	}
	return bsf;
}

int init(int N, int X[], int Y[]){
	n = N;
	x.resize(n);
	y.resize(n);
	st.resize(4*n, 1);
	for (int i=0; i<n; i++){
		x[i] = X[i];
		y[i] = Y[i];
		update(i, X[i]);
	}
	return solve();
}

int updateX(int pos, int val){
	x[pos] = val;
	update(pos, val);
	return solve();
}

int updateY(int pos, int val){
	y[pos] = val;
	return solve();
}

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