Submission #503415

#	Time	Username	Problem	Language	Result	Execution time	Memory
503415		AmirElarbi	말 (IOI15_horses)	C++14	17 / 100	236 ms	33352 KiB

horses

#include <bits/stdc++.h>
#include "horses.h"
#define vi vector<int>
#define ve vector
#define ll unsigned long long
#define vf vector<float>
#define vll vector<pair<ll,ll>>
#define ii pair<int,int>
#define vvi vector<vi>
#define vii vector<ii>
#define gii greater<ii>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define INF 1e9
#define eps 1e-7
#define eps1 1e-25
#define optimise ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define MAX_A 1e5+5
#define V 450
using namespace std;
const int MOD = 1e9+7;
ll x[500005],y[500005];
ll dp[500005],memo[500005];
int n,k;
ll srch(int i, ll nb){
	if(i >= n) return 0;
	if(dp[i]!=-1)return dp[i];
	while(log10(x[i])+log10(y[i])+log10(nb) > 18){
		nb/=x[k];
		k++;
	}
	assert(log10(x[i])+log10(y[i])+log10(nb) <= 18);
	return dp[i] = max(srch(i+1,(nb*x[i])), ((nb*x[i])*y[i]));
}
int init(int N, int X[], int Y[]) {
	n = N;
	memset(dp,-1,sizeof dp);
	for (int i = 0; i < n; ++i)
	{
		x[i] = X[i];
		y[i] = Y[i];
	}
	memo[0] = 1;
	for (int j = 1; j <= n; ++j)
	 {
	 	memo[j]=(memo[j-1]%MOD*x[j-1]%MOD)%MOD;
	 } 
	ll a = 1;
	k = n-1;
	while(a <= 1e10 && k >= 0){
		a*=x[k];
		k--;
	}
	k++;
	ll res= (srch(k,1)%MOD*memo[k]%MOD)%MOD;
	return res%MOD;
}

int updateX(int pos, int val) {	
	x[pos] = val;
	ll a = 1;
	k = n-1;
	while(a <= 1e10 && k >= 0){
		a*=x[k];
		k--;
	}
	k++;
	for (int j = k; j < n; ++j)
	{
		dp[j] = -1;
	}
	ll res= (srch(k,1)%MOD*memo[k]%MOD)%MOD;
	return res%MOD;
}

int updateY(int pos, int val) {
	y[pos] = val;
	ll a = 1;
	k = n-1;
	while(a <= 1e10 && k >= 0){
		a*=x[k];
		k--;
	}
	k++;
	for (int j = k; j < n; ++j)
	{
		dp[j] = -1;
	}
	ll res= (srch(k,1)%MOD*memo[k]%MOD)%MOD;
	return res%MOD;
}

Compilation message (stderr)

horses.cpp: In function 'long long unsigned int srch(int, long long unsigned int)':
horses.cpp:29:10: warning: comparison of integer expressions of different signedness: 'long long unsigned int' and 'int' [-Wsign-compare]
   29 |  if(dp[i]!=-1)return dp[i];
      |     ~~~~~^~~~
horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:52:8: warning: conversion from 'long long unsigned int' to 'double' may change value [-Wconversion]
   52 |  while(a <= 1e10 && k >= 0){
      |        ^
horses.cpp:58:12: warning: conversion from 'long long unsigned int' to 'int' may change value [-Wconversion]
   58 |  return res%MOD;
      |         ~~~^~~~
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:65:8: warning: conversion from 'long long unsigned int' to 'double' may change value [-Wconversion]
   65 |  while(a <= 1e10 && k >= 0){
      |        ^
horses.cpp:75:12: warning: conversion from 'long long unsigned int' to 'int' may change value [-Wconversion]
   75 |  return res%MOD;
      |         ~~~^~~~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:82:8: warning: conversion from 'long long unsigned int' to 'double' may change value [-Wconversion]
   82 |  while(a <= 1e10 && k >= 0){
      |        ^
horses.cpp:92:12: warning: conversion from 'long long unsigned int' to 'int' may change value [-Wconversion]
   92 |  return res%MOD;
      |         ~~~^~~~

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