Submission #560153

#	Time	Username	Problem	Language	Result	Execution time	Memory
560153		Koosha_mv	Horses (IOI15_horses)	C++14	17 / 100	1576 ms	35528 KiB

horses

#include <bits/stdc++.h>
using namespace std;
#define dbgv(v) cout<<#v<<" = "; f(i,0,v.size()) cout<<v[i]<<" "; cout<<endl
#define dbga(a,x,y) cout<<#a<<" = "; f(i,x,y) cout<<a[i]<<" "; cout<<endl
#define erorp(x) cout<<#x<<"={"<<x.F<<" , "<<x.S<<"}"<<endl
#define eror(x) cout<<#x<<'='<<(x)<<endl
#define f_(i,a,b) for(int i=a;i>=b;i--)
#define f(i,a,b) for(int i=a;i<b;i++)
#define nb(x) __builtin_popcount(x)
#define all(v) v.begin(),v.end()
#define bit(n,k) (((n)>>(k))&1)
#define Add(x,y) x=(x+y)%mod
#define maxm(a,b) a=max(a,b)
#define minm(a,b) a=min(a,b)
#define lst(x) x[x.size()-1]
#define sz(x) int(x.size())
#define mp make_pair
#define ll long long
#define pb push_back
#define S second
#define F first
#include "horses.h"

const int N=5e5+99,mod=1e9+7;
const ll inf=1e18+mod;

int n,t,a[N],b[N],L[N],R[N],seg[N<<1];
ll pd=1;
set<int> s;

ll pow(ll x,ll y,ll mod){return(!y?1:pow(x*x%mod,y/2,mod)*(y&1?x:1))%mod;}

void build(){
	f(i,0,n) seg[i+n]=b[i];
	f_(i,n-1,1) seg[i]=max(seg[i<<1],seg[i<<1|1]);
}
void update(int id,int val){
	seg[id]=val;
	for(id>>=1;id>0;id>>=1){
		seg[id]=max(seg[id<<1],seg[id<<1|1]);
	}
}
int get(int l,int r){
	int ans=0;
	for(l+=n,r+=n;l<r;l>>=1,r>>=1){
		if(l&1) maxm(ans,seg[l++]);
		if(r&1) maxm(ans,seg[--r]);
	}
	return ans;
}
int solve(){
	ll ans=1,res=pd;
	f(i,0,n) s.insert(i);
	build();
	f_(i,n-1,0){
		if(ans>mod) break;
		ans=1ll*ans*a[i]%mod;
		maxm(ans,1ll*a[i]*b[i]%mod);
		res=1ll*res*pow(a[i],mod-2,mod)%mod;
		if(i==0) break;
	}
	return 1ll*res*ans%mod;
}
int init(int _n, int X[], int Y[]) {
	n=_n;
	f(i,0,n) a[i]=X[i];
	f(i,0,n) b[i]=Y[i];
	f(i,0,n){
		pd=1ll*pd*a[i]%mod;
		if(a[i]>1) s.insert(i);
	}
	build();
	return solve();
}
int updateX(int pos, int val) {
	if(a[pos]==1 && val!=1) s.insert(pos);
	if(a[pos]!=1 && val==1) s.erase(pos);
	pd=1ll*pd*pow(a[pos],mod-2,mod)%mod;
	a[pos]=val;
	pd=1ll*pd*a[pos]%mod;
	return solve();
}
int updateY(int pos, int val) {
	b[pos]=val;
	update(pos+n,val);
	return solve();
}
/*
int32_t main(){
	ios:: sync_with_stdio(0), cin.tie(0), cout.tie(0);
	int n,q,a[10],b[10];
	cin>>n;
	f(i,0,n) cin>>a[i];
	f(i,0,n) cin>>b[i];
	cout<<init(n,a,b)<<endl;
	cin>>q;
	while(q--){
		int t,pos,val;
		cin>>t>>pos>>val;
		if(t==1) cout<<updateX(pos,val)<<endl;
		else cout<<updateY(pos,val)<<endl;
	}
}*/
/*
3
2 1 3
3 4 1
1
2 1 2
*/

Compilation message (stderr)

horses.cpp: In function 'long long int pow(long long int, long long int, long long int)':
horses.cpp:31:21: warning: declaration of 'mod' shadows a global declaration [-Wshadow]
   31 | ll pow(ll x,ll y,ll mod){return(!y?1:pow(x*x%mod,y/2,mod)*(y&1?x:1))%mod;}
      |                     ^
horses.cpp:24:20: note: shadowed declaration is here
   24 | const int N=5e5+99,mod=1e9+7;
      |                    ^~~
horses.cpp: In function 'int solve()':
horses.cpp:62:20: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   62 |  return 1ll*res*ans%mod;
      |         ~~~~~~~~~~~^~~~

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