Submission #432720

#	Time	Username	Problem	Language	Result	Execution time	Memory
432720		daniel920712	Horses (IOI15_horses)	C++14	0 / 100	18 ms	13620 KiB

horses

#include "horses.h"
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
using namespace std;
long long XX[100005];
long long YY[100005];
long long how[100005]={0};
long long MOD=1e9+7;
long long N;
struct A
{
    long long l,r;
    long long con;
    A* nxl,*nxr;
    void build(long long ll,long long rr)
    {
        l=ll;
        r=rr;
        if(ll+1==rr)
        {
            con=XX[ll];
            return;
        }
        nxl=(A*) malloc(sizeof(A));
        nxr=(A*) malloc(sizeof(A));
        nxl->build(ll,(ll+rr)/2);
        nxr->build((ll+rr)/2,rr);
        con=nxl->con*nxr->con%MOD;
    }
    void cha(long long where,long long tt)
    {
        if(l==where&&r==where+1)
        {
            con=tt;
            return;
        }
        if(where<(l+r)/2) nxl->cha(where,tt);
        else nxr->cha(where,tt);
        con=nxl->con*nxr->con%MOD;
    }
    long long Find(long long ll,long long rr)
    {
        if(ll==l&&rr==r) return con;
        if(rr<=(l+r)/2) return nxl->Find(ll,rr);
        if(ll>=(l+r)/2) return nxr->Find(ll,rr);
        return nxl->Find(ll,(l+r)/2)*nxr->Find((l+r)/2,rr)%MOD;
    }
};
A* root;
int init(int N, int X[], int Y[])
{
    long long ans=0,t=1,i,now=0;
    ::N=N;

    for(i=0;i<N;i++)
    {
        XX[i]=(long long) X[i];
        YY[i]=(long long) Y[i];
    }
    root=(A*)malloc(sizeof(root));
    root->build(0,N);
    for(i=N-1;i>=0;i--)
    {
        if(YY[i]>now)
        {
            now=YY[i];
            t=YY[i];
        }
        ans=t*root->Find(0,i+1)%MOD;
        if(now<1000000000) now*=XX[i];
        else break;
        t*=XX[i];
        t%=MOD;
    }
	return (int) ans;
}

int updateX(int pos, int val)
{
    long long ans=0,t=1,i,now=0;
    XX[pos]=(long long) val;
    root->cha(pos,val);
    for(i=N-1;i>=0;i--)
    {
        if(YY[i]>now)
        {
            now=YY[i];
            t=YY[i];
        }
        ans=t*root->Find(0,i+1)%MOD;
        if(now<1000000000) now*=XX[i];
        else break;
        t*=XX[i];
        t%=MOD;
    }
	return (int) ans;
}

int updateY(int pos, int val)
{
    long long ans=0,t=1,i,now=0;
    YY[pos]=(long long) val;
    for(i=N-1;i>=0;i--)
    {
        if(YY[i]>now)
        {
            now=YY[i];
            t=YY[i];
        }
        ans=t*root->Find(0,i+1)%MOD;
        if(now<1000000000) now*=XX[i];
        else break;
        t*=XX[i];
        t%=MOD;
    }
	return (int) ans;
}

Compilation message (stderr)

horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:51:14: warning: declaration of 'N' shadows a global declaration [-Wshadow]
   51 | int init(int N, int X[], int Y[])
      |          ~~~~^
horses.cpp:10:11: note: shadowed declaration is here
   10 | long long N;
      |           ^

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