Submission #206299

#	Time	Username	Problem	Language	Result	Execution time	Memory
206299		oko	Horses (IOI15_horses)	C++14	17 / 100	1589 ms	60024 KiB

horses

#include "horses.h"
#include <stdio.h>
#include <stdlib.h>
#include <bits/stdc++.h>
using namespace std;
long long n,a[500500],b[500500],mod=1e9+7,tree[2005000],mxtree[2005000];
multiset<pair<int,long long> >ms;
long long qrx(int nod,int l,int r,int x,int y)
{
    if(x<=l&&r<=y)return tree[nod];
    else if(r<x||y<l)return 1ll;
    int mid=(l+r)/2;
    return (qrx(nod*2,l,mid,x,y)*qrx(nod*2+1,mid+1,r,x,y))%mod;
}
long long qry(int nod,int l,int r,int x,int y)
{
    if(x<=l&&r<=y)return mxtree[nod];
    else if(r<x||y<l)return 0ll;
    int mid=(l+r)/2;
    return max(qry(nod*2,l,mid,x,y),qry(nod*2+1,mid+1,r,x,y));
}
long long slov()
{
    long long x=1,ans=0;
    if(ms.size()==0)return qry(1,0,n+5,0,n-1);
    multiset<pair<int,long long> >::iterator it=--ms.end(),st;
    while(true)
    {
        pair<int,long long>z=*it;
        long long in=z.first,val=z.second;
        x*=val;
        if(x>=(long long)2e9)break;
        st=it;
        if(it==ms.begin())break;
        it--;
    }
    x=1;
    long long ml=1;
    pair<int,long long>az=*st;
    if(az.first)
    {
        ml=qrx(1,0,n+5,0,az.first-1);
        ans=b[az.first-1];
    }
    for(st;st!=ms.end();st++)
    {
        pair<int,long long>z=*st;
        long long ind=z.first,val=z.second,nxt;
        x*=val;
        if(st==--ms.end())nxt=n;
        else
        {
            pair<int,long long>zz=*(++st);
            st--;
            nxt=zz.first;
        }
        long long mx=x*b[ind];
        ans=max(ans,mx);
    }
    ans%=mod;
    for(int i=0;i<az.first;i++)
    {
        ans*=a[i];
        ans%mod;
    }
    return ans;
}
void upy(int nod,int l,int r,int x,long long val)
{
    if(x<l||r<x)return;
    if(l==r)
    {
        mxtree[nod]=val;
        return;
    }
    int mid=(l+r)/2;
    upy(nod*2,l,mid,x,val);
    upy(nod*2+1,mid+1,r,x,val);
    mxtree[nod]=max(mxtree[nod*2],mxtree[nod*2+1]);
}
void upx(int nod,int l,int r,int x,long long val)
{
    if(x<l||r<x)return;
    if(l==r)
    {
        tree[nod]=val;
        return;
    }
    int mid=(l+r)/2;
    upx(nod*2,l,mid,x,val);
    upx(nod*2+1,mid+1,r,x,val);
    tree[nod]=(tree[nod*2]*tree[nod*2+1])%mod;
}
int init(int N, int X[], int Y[])
{
    n=N;
    for(int i=0;i<n;i++)
    {
        a[i]=X[i];
        b[i]=Y[i];
        ms.insert({i,a[i]});
        upx(1,0,n+5,i,a[i]);
        upy(1,0,n+5,i,b[i]);
    }
    return slov();
}
int updateX(int pos, int val)
{
    ms.erase(ms.lower_bound({pos,a[pos]}));
    a[pos]=val;
    ms.insert({pos,a[pos]});
    upx(1,0,n+5,pos,val);
    return slov();
}
int updateY(int pos, int val)
{
    b[pos]=val;
    upy(1,0,n+5,pos,val);
    return slov();
}

Compilation message (stderr)

horses.cpp: In function 'long long int slov()':
horses.cpp:25:37: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
     if(ms.size()==0)return qry(1,0,n+5,0,n-1);
                                    ~^~
horses.cpp:25:43: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
     if(ms.size()==0)return qry(1,0,n+5,0,n-1);
                                          ~^~
horses.cpp:30:19: warning: unused variable 'in' [-Wunused-variable]
         long long in=z.first,val=z.second;
                   ^~
horses.cpp:42:21: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
         ml=qrx(1,0,n+5,0,az.first-1);
                    ~^~
horses.cpp:45:11: warning: statement has no effect [-Wunused-value]
     for(st;st!=ms.end();st++)
           ^
horses.cpp:48:44: warning: variable 'nxt' set but not used [-Wunused-but-set-variable]
         long long ind=z.first,val=z.second,nxt;
                                            ^~~
horses.cpp:64:12: warning: statement has no effect [-Wunused-value]
         ans%mod;
         ~~~^~~~
horses.cpp:38:15: warning: variable 'ml' set but not used [-Wunused-but-set-variable]
     long long ml=1;
               ^~
horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:102:18: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
         upx(1,0,n+5,i,a[i]);
                 ~^~
horses.cpp:103:18: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
         upy(1,0,n+5,i,b[i]);
                 ~^~
horses.cpp:105:16: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
     return slov();
            ~~~~^~
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:112:14: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
     upx(1,0,n+5,pos,val);
             ~^~
horses.cpp:113:16: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
     return slov();
            ~~~~^~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:118:14: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
     upy(1,0,n+5,pos,val);
             ~^~
horses.cpp:119:16: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
     return slov();
            ~~~~^~

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