Submission #1000210

#	Time	Username	Problem	Language	Result	Execution time	Memory
1000210		jer033	Horses (IOI15_horses)	C++17	34 / 100	1588 ms	12412 KiB

horses

#include "horses.h"
#include <bits/stdc++.h>
using ll = long long;
using namespace std;
const ll MOD = 1'000'000'007;
const ll INF = 1'000'000'006;

ll regmul(ll a, ll b)
{
	return (a*b)%MOD;
}

ll boundmul(ll a, ll b)
{
	return min(INF, a*b);
}

vector<int> x;
vector<int> y;
int n;

ll solve(int N)
{
	ll safe = x[0];
	ll bes = y[0];
	ll currmul = 1;
	for (int i=1; i<N; i++)
	{
		if (boundmul(boundmul(currmul, x[i]), y[i])>=bes)
		{
			safe = regmul(safe, currmul);
			safe = regmul(safe, x[i]);
			currmul = 1;
			bes = y[i];
		}
		else
		{
			currmul = boundmul(currmul, x[i]);
		}
	}
	return regmul(safe, bes);
}

int init(int N, int X[], int Y[]) {
	for (int i=0; i<N; i++)
	{
		x.push_back(X[i]);
		y.push_back(Y[i]);
	}
	n=N;
	return solve(n);
}

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

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

Compilation message (stderr)

horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:51:14: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
   51 |  return solve(n);
      |         ~~~~~^~~
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:56:14: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
   56 |  return solve(n);
      |         ~~~~~^~~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:61:14: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
   61 |  return solve(n);
      |         ~~~~~^~~

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