Submission #846802

#	Time	Username	Problem	Language	Result	Execution time	Memory
846802		12345678	Horses (IOI15_horses)	C++17	17 / 100	163 ms	50452 KiB

horses

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

using namespace std;

#define ll long long

const ll nx=5e5+5, mod=1e9+7, mx=(ll)INT_MAX+1;
int n;
vector<int> x, y;

struct segtree
{
	struct node
	{
		ll pre, suf, sm, ans, p; 
	} d[4*nx];
	ll a[nx], b[nx];
	void update(int l, int r, int i, int idx, int vx, int vy)
	{
		if (r<idx||idx<l) return;
		if (l==r)
		{
			d[i].ans=(vx*vy)%mod;
			d[i].pre=d[i].sm=vx;
			d[i].suf=1; d[i].p=vy;
			return;
		}
		int md=(l+r)/2;
		update(l, md, 2*i, idx, vx, vy);
		update(md+1, r, 2*i+1, idx, vx, vy);
		if (d[2*i].p<min(d[2*i].suf*d[2*i+1].pre, mod)*d[2*i+1].p)
		{
			d[i].ans=(d[2*i].sm*d[2*i+1].ans)%mod;
			d[i].pre=min(d[2*i].sm*d[2*i+1].pre, mx);
			d[i].sm=min(d[2*i].sm*d[2*i+1].sm, mx);
			d[i].suf=d[2*i+1].suf;
			d[i].p=d[2*i+1].p;
		}
		else
		{
			d[i].ans=d[2*i].ans;
			d[i].pre=d[2*i].pre;
			d[i].sm=min(d[2*i].sm*d[2*i+1].sm, mx);
			d[i].suf=min(d[2*i].suf*d[2*i+1].sm, mx);
			d[i].p=d[2*i].p;
		}
	}
} s;

int init(int N, int X[], int Y[]) {
	n=N;
	x.resize(N+1); y.resize(N+1);
	for (int i=1; i<=N; i++) s.update(1, n, 1, i, X[i-1], Y[i-1]);
	return s.d[1].ans;
}

int updateX(int pos, int val) {	
	x[pos+1]=val;
	s.update(1, n, 1, pos+1, x[pos+1], y[pos+1]);
	return s.d[1].ans;
}

int updateY(int pos, int val) {
	y[pos+1]=val;
	s.update(1, n, 1, pos+1, x[pos+1], y[pos+1]);
	return s.d[1].ans;
}

Compilation message (stderr)

horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:55:16: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   55 |  return s.d[1].ans;
      |         ~~~~~~~^~~
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:61:16: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   61 |  return s.d[1].ans;
      |         ~~~~~~~^~~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:67:16: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   67 |  return s.d[1].ans;
      |         ~~~~~~~^~~

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