Submission #206318

#	Time	Username	Problem	Language	Result	Execution time	Memory
206318		oko	Horses (IOI15_horses)	C++14	54 / 100	1592 ms	22612 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];
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;
}
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;
}
long long slov()
{
    long long x=1,ans=0,st;
    int i=n-1;
     while(1)
    {
        x*=a[i];
        if(x>(long long)2e9)break;
        st=i;
        if(i==0)break;
        i--;
    }
    if(st)ans=b[st-1];
    x=1;
    for(int i=st;i<n;i++)
    {
        x*=a[i];
        ans=max(ans,x*b[i]);
    }
    ans%=mod;
    ans*=qrx(1,0,n+5,0,st-1);
    return ans%mod;
}
int init(int N, int X[], int Y[])
{
    n=N;
    for(int i=0;i<n;i++)
    {
        a[i]=X[i];
        upx(1,0,n+5,i,a[i]);
        b[i]=Y[i];
    }
    return slov();
}
int updateX(int pos, int val)
{
    a[pos]=val;
    upx(1,0,n+5,pos,val);
    return slov();
}
int updateY(int pos, int val)
{
    b[pos]=val;
    return slov();
}

Compilation message (stderr)

horses.cpp: In function 'long long int slov()':
horses.cpp:30:12: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
     int i=n-1;
           ~^~
horses.cpp:41:13: warning: declaration of 'i' shadows a previous local [-Wshadow]
     for(int i=st;i<n;i++)
             ^
horses.cpp:30:9: note: shadowed declaration is here
     int i=n-1;
         ^
horses.cpp:41:15: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
     for(int i=st;i<n;i++)
               ^~
horses.cpp:47:19: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
     ans*=qrx(1,0,n+5,0,st-1);
                  ~^~
horses.cpp:47:26: 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:56:18: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
         upx(1,0,n+5,i,a[i]);
                 ~^~
horses.cpp:59:16: 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:64:14: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
     upx(1,0,n+5,pos,val);
             ~^~
horses.cpp:65:16: 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:70:16: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
     return slov();
            ~~~~^~
horses.cpp: In function 'long long int slov()':
horses.cpp:29:25: warning: 'st' may be used uninitialized in this function [-Wmaybe-uninitialized]
     long long x=1,ans=0,st;
                         ^~

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