Submission #1013630

#	Time	Username	Problem	Language	Result	Execution time	Memory
1013630		Mardonbekhazratov	Horses (IOI15_horses)	C++17	17 / 100	1594 ms	18364 KiB

horses

#include "horses.h"
#include<algorithm>
#include<vector>
#include<iostream>
const __int128_t INFLL=1e18;
const int INF=1e9;
const int MOD=1e9+7;

using namespace std;

int n;
vector<int>x,y;

int inv(int x){
	return x>1 ? MOD-(long long)(MOD/x)*inv(MOD%x)%MOD : x;
}

long long pref;

int get(){
	vector<__int128_t>suff(n+2);
	suff[n]=1;
	for(int i=n-1;i>=0;i--){
		suff[i]=max(suff[i+1]*x[i],suff[n]*x[i]*y[i]);
		pref=pref*inv(x[i])%MOD;
		if(suff[i]>=INFLL){
			long long ans=suff[i]%MOD;
			pref;
			return ans;
		}
	}
	return suff[0]%MOD;
}

int init(int N, int X[], int Y[]) {
	n=N;
	pref=1;
	x.resize(n);
	y.resize(n);
	for(int i=0;i<n;i++) x[i]=X[i],y[i]=Y[i],pref=pref*x[i]%MOD;
	return get();
}


int updateX(int pos, int val) {	
	pref=pref*inv(x[pos])%MOD*val%MOD;
	x[pos]=val;
	return get();
}

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

Compilation message (stderr)

horses.cpp: In function 'int inv(int)':
horses.cpp:14:13: warning: declaration of 'x' shadows a global declaration [-Wshadow]
   14 | int inv(int x){
      |         ~~~~^
horses.cpp:12:12: note: shadowed declaration is here
   12 | vector<int>x,y;
      |            ^
horses.cpp:15:13: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   15 |  return x>1 ? MOD-(long long)(MOD/x)*inv(MOD%x)%MOD : x;
      |         ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
horses.cpp: In function 'int get()':
horses.cpp:27:25: warning: conversion from '__gnu_cxx::__alloc_traits<std::allocator<__int128>, __int128>::value_type' {aka '__int128'} to 'long long int' may change value [-Wconversion]
   27 |    long long ans=suff[i]%MOD;
horses.cpp:28:4: warning: statement has no effect [-Wunused-value]
   28 |    pref;
      |    ^~~~
horses.cpp:29:11: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   29 |    return ans;
      |           ^~~
horses.cpp:32:16: warning: conversion from '__gnu_cxx::__alloc_traits<std::allocator<__int128>, __int128>::value_type' {aka '__int128'} to 'int' may change value [-Wconversion]
   32 |  return suff[0]%MOD;

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