Submission #640018

#	Time	Username	Problem	Language	Result	Execution time	Memory
640018		ggoh	Horses (IOI15_horses)	C++14	100 / 100	1294 ms	79496 KiB

horses

#include "horses.h"
#include<bits/stdc++.h>
using namespace std;
#define sz(v) ((int)(v).size())
typedef long long lint;
typedef pair<int,int> pii;

lint Z=1e9+7;
int n;
lint po(lint p,int q)
{
	if(q==0)return 1;
	if(q==1)return p;
	lint o=po(p,q/2);
	o=o*o%Z;
	if(q%2)o=o*p%Z;
	return o;
}
struct Tree{
	long double l;
	lint v;
}seg[1<<20];
long double lazyL[1<<20];
lint lazyV[1<<20];
vector<int>XX,YY;

void push(int num,int s,int e)
{
	seg[num].l+=lazyL[num];
	if(s!=e)
	{
		lazyL[2*num]+=lazyL[num];
		lazyL[2*num+1]+=lazyL[num];
	}
	lazyL[num]=0;
	seg[num].v=seg[num].v*lazyV[num]%Z;
	if(s!=e)
	{
		lazyV[2*num]=lazyV[2*num]*lazyV[num]%Z;
		lazyV[2*num+1]=lazyV[2*num+1]*lazyV[num]%Z;
	}
	lazyV[num]=1;
}
void update(int num,int s,int e,int l,int r,long double x,lint z)
{
	push(num,s,e);
	if(s>r||l>e)return ;
	if(l<=s&&e<=r)
	{
		seg[num].l+=x;
		seg[num].v=seg[num].v*z%Z;
		if(s!=e)
		{
			lazyL[num*2]+=x;
			lazyL[num*2+1]+=x;
			lazyV[num*2]=lazyV[num*2]*z%Z;
			lazyV[num*2+1]=lazyV[num*2+1]*z%Z;
		}
		return ;
	}
	update(num*2,s,(s+e)/2,l,r,x,z);
	update(num*2+1,(s+e)/2+1,e,l,r,x,z);
	if(seg[num*2].l>seg[num*2+1].l)
	{
		seg[num].l=seg[num*2].l;
		seg[num].v=seg[num*2].v;
	}
	else
	{
		seg[num].l=seg[num*2+1].l;
		seg[num].v=seg[num*2+1].v;
	}
}

int init(int N, int X[], int Y[]) {
	n=N;
	for(int i=1;i<(1<<20);i++)lazyV[i]=seg[i].v=1;
	for(int i=0;i<n;i++)
	{
		long double x=log(X[i]);
		long double y=log(Y[i]);
		XX.push_back(X[i]);
		YY.push_back(Y[i]);
		update(1,0,n-1,i,n-1,x,X[i]);
		update(1,0,n-1,i,i,y,Y[i]);
	}
	return (int)seg[1].v;
}

int updateX(int pos, int val) {
	long double x0=log(XX[pos]);
	long double x1=log(val);
	lint mul=po(XX[pos],Z-2)*val%Z;
	XX[pos]=val;
	update(1,0,n-1,pos,n-1,x1-x0,mul);
	return (int)seg[1].v;
}

int updateY(int pos, int val) {
	long double y0=log(YY[pos]);
	long double y1=log(val);
	lint mul=po(YY[pos],Z-2)*val%Z;
	YY[pos]=val;
	update(1,0,n-1,pos,pos,y1-y0,mul);
	return (int)seg[1].v;
}

Compilation message (stderr)

horses.cpp: In function 'int updateX(int, int)':
horses.cpp:93:23: warning: conversion from 'lint' {aka 'long long int'} to 'int' may change value [-Wconversion]
   93 |  lint mul=po(XX[pos],Z-2)*val%Z;
      |                      ~^~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:102:23: warning: conversion from 'lint' {aka 'long long int'} to 'int' may change value [-Wconversion]
  102 |  lint mul=po(YY[pos],Z-2)*val%Z;
      |                      ~^~

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