Submission #1312874

#	Time	Username	Problem	Language	Result	Execution time	Memory
1312874		nikaa123	Horses (IOI15_horses)	C++20	34 / 100	188 ms	50800 KiB

horses

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

const int inf = INT_MAX;
const ll mod = 1000000007;
const int S = 5e5+5;

ll n;
ll x[S],y[S];
ll pref[S];
float prefl[S];

struct NODE{
	ll modval = 1;
	float logval = 0;
} t[4*S],lazy[4*S];

NODE merge(NODE a, NODE b) {
	if (a.logval >= b.logval) return a;
	return b;
}

void applay(int node, ll mval, float lval) {
	t[node].modval = (t[node].modval * mval) % mod;
	lazy[node].modval = (lazy[node].modval * mval) % mod;

	t[node].logval += lval;
	lazy[node].logval += lval;
}

void push(int node) {
	if (!(lazy[node].modval == 1 && lazy[node].logval == 0)) {
		applay(node*2,lazy[node].modval, lazy[node].logval);
		applay(node*2+1,lazy[node].modval, lazy[node].logval);
		lazy[node].modval = 1;
		lazy[node].logval = 0;
	}
}

void update(int node, int l, int r, int L, int R, ll val, float lval) {
	if (r < L || l > R) return;
	if (l >= L && r <= R) {
		applay(node,val,lval);
		return;
	}
	push(node);
	int mid = (l+r)/2;
	update(node*2,l,mid,L,R,val,lval);
	update(node*2+1,mid+1,r,L,R,val,lval);
	t[node] = merge(t[node*2],t[node*2+1]);
}

NODE getans(int node, int l, int r, int L, int R) {
	NODE res; res.modval = -inf; res.logval = -inf;
	if (r < L || l > R) return res;
	if (l >= L && r <= R) return t[node];
	push(node);
	int mid = (l+r)/2;
	return merge(getans(node*2,l,mid,L,R),getans(node*2+1,mid+1,r,L,R));
}

ll inv(ll x, int k = mod - 2) {
	ll res = 1;
	while (k) {
		if (k&1) {
			res = (res * x) % mod;
		}
		x = (x * x) % mod;
		k >>= 1;
	}
	return res;
}

int init(int N, int X[], int Y[]) {
	n = N;
	for (int i = 0; i < n; i++) {
		x[i] = X[i];
		y[i] = Y[i];
	}
	pref[0] = x[0];
	prefl[0] = log(x[0]);
	for (int i = 1; i < n; i++) {
		pref[i] = (pref[i-1] * x[i]) % mod;
		prefl[i] = prefl[i-1] + log(x[i]);
	}
	for (int i = 0; i < n; i++) {
		pref[i] = (pref[i] * y[i]) % mod;
		prefl[i] += log(y[i]);
	}
	for (int i = 1; i <= n; i++) {
		update(1,1,n,i,i,pref[i-1],prefl[i-1]);
	}
	return getans(1,1,n,1,n).modval;
}

int updateX(int pos, int val) {	
	update(1,1,n,pos+1,n,inv(x[pos]),-log(x[pos]));
	x[pos] = val;
	update(1,1,n,pos+1,n,x[pos],log(x[pos]));
	return getans(1,1,n,1,n).modval;
}

int updateY(int pos, int val) {
	update(1,1,n,pos+1,pos+1,inv(y[pos]),-log(y[pos]));
	y[pos] = val;
	update(1,1,n,pos+1,pos+1,y[pos],log(y[pos]));
	return getans(1,1,n,1,n).modval;
}

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