Submission #1011270

#	Time	Username	Problem	Language	Result	Execution time	Memory
1011270		Mardonbekhazratov	Horses (IOI15_horses)	C++17	17 / 100	1548 ms	18436 KiB

horses

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

using namespace std;

int n;
vector<int>x,y;

long long merge(long long a,long long b){
	__int128_t f=a,g=b;
	if(f*g>INFLL) return INFLL;
	long long h=f*g;
	return h;
}

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

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


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

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

Compilation message (stderr)

horses.cpp: In function 'long long int merge(long long int, long long int)':
horses.cpp:17:15: warning: conversion from '__int128' to 'long long int' may change value [-Wconversion]
   17 |  long long h=f*g;
      |              ~^~
horses.cpp: In function 'int get()':
horses.cpp:32:61: warning: conversion from '__gnu_cxx::__alloc_traits<std::allocator<long long int>, long long int>::value_type' {aka 'long long int'} to 'int' may change value [-Wconversion]
   32 |    if(i!=0 && x[i-1]*y[i-1]>suff[i+1]) return pref[i]*y[i-1]%MOD;
horses.cpp:33:32: warning: conversion from '__gnu_cxx::__alloc_traits<std::allocator<long long int>, long long int>::value_type' {aka 'long long int'} to 'int' may change value [-Wconversion]
   33 |    return suff[i+1]%MOD*pref[i]%MOD;
horses.cpp:28:6: warning: unused variable 'id' [-Wunused-variable]
   28 |  int id=-1;
      |      ^~
horses.cpp:29:12: warning: unused variable 'ans' [-Wunused-variable]
   29 |  long long ans=0,cur=1;
      |            ^~~
horses.cpp:29:18: warning: unused variable 'cur' [-Wunused-variable]
   29 |  long long ans=0,cur=1;
      |                  ^~~

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