Submission #206336

#	Time	Username	Problem	Language	Result	Execution time	Memory
206336		oko	Horses (IOI15_horses)	C++14	37 / 100	983 ms	53240 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<int>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()
{
    if(ms.size()==0)return qry(1,0,n+5,0,n-1);
    long long x=1,ans=0,st;
    multiset<int>::iterator it=--ms.end(),its;
    while(1)
    {
        int i=*it;
        x*=a[i];
        if(x>(long long)2e9)break;
        its=it;
        if(it==ms.begin())break;
        it--;
    }
    st=*its;
    if(st)
    {
        if(its!=ms.begin())
        {
            multiset<int>::iterator ls=its;
            ls--;
            ans=b[*ls];
        }
    }
    x=1;
    for(its;its!=ms.end();its++)
    {
        int i=*its,nxt;
        x*=a[i];
        if(its==--ms.end())nxt=n;
        else
        {
            multiset<int>::iterator nxti=its;
            nxti++;
            nxt=*nxti;
        }
        ans=max(ans,x*qry(1,0,n+5,i,nxt-1));
    }
    ans%=mod;
    ans*=qrx(1,0,n+5,0,st-1);
    return ans%mod;
}
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];
        if(a[i]!=1)ms.insert(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)
{
    if(a[pos]!=1)ms.erase(ms.lower_bound(pos));
    a[pos]=val;
    if(a[pos]!=1)ms.insert(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:24:37: 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:24:43: 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:47:12: warning: statement has no effect [-Wunused-value]
     for(its;its!=ms.end();its++)
            ^
horses.cpp:51:32: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
         if(its==--ms.end())nxt=n;
                                ^
horses.cpp:58:32: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
         ans=max(ans,x*qry(1,0,n+5,i,nxt-1));
                               ~^~
horses.cpp:61:19: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
     ans*=qrx(1,0,n+5,0,st-1);
                  ~^~
horses.cpp:61:26: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
     ans*=qrx(1,0,n+5,0,st-1);
                        ~~^~
horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:98:18: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
         upx(1,0,n+5,i,a[i]);
                 ~^~
horses.cpp:99:18: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
         upy(1,0,n+5,i,b[i]);
                 ~^~
horses.cpp:101:16: 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:108:14: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
     upx(1,0,n+5,pos,val);
             ~^~
horses.cpp:109:16: 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:114:14: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
     upy(1,0,n+5,pos,val);
             ~^~
horses.cpp:115:16: 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: 20 / 20
• Subtask 4: 0 / 23
• Subtask 5: 0 / 23