Submission #781897

#	Time	Username	Problem	Language	Result	Execution time	Memory
781897		Lyrically	Horses (IOI15_horses)	C++17	100 / 100	159 ms	58364 KiB

horses

#include<bits/stdc++.h>
using namespace std;
#define pii pair<int,int>
#define pb push_back
#define rep(i,n) for(int i=0;i<n;i++)
#define rep1(i,n) for(int i=1;i<=n;i++)
int read(){int x;scanf("%d",&x);return x;}
void print(int x){printf("%d\n",x);}
const int mod=1000000007;
long long n;
struct node
{
	long long ans,mul;
	double lgmul,lgans;
}seg[500005*4];
long long x[500005],y[500005];
void upd(int id)
{
	seg[id].mul=seg[id*2].mul*seg[id*2+1].mul%mod;
	seg[id].lgmul=seg[id*2].lgmul+seg[id*2+1].lgmul;
	double fi=seg[id*2].lgans;
	double se=seg[id*2].lgmul+seg[id*2+1].lgans;
	if(fi>se)
	{
		seg[id].ans=seg[id*2].ans;
		seg[id].lgans=seg[id*2].lgans;
	}
	else
	{
		seg[id].ans=seg[id*2].mul*seg[id*2+1].ans%mod;
		seg[id].lgans=seg[id*2].lgmul+seg[id*2+1].lgans;
	}
}
void build(int id,int l,int r)
{
	if(l==r)
	{
		seg[id].ans=x[l]*y[l]%mod;
		seg[id].mul=x[l];
		seg[id].lgmul=log(x[l]);
		seg[id].lgans=log(x[l])+log(y[l]);
		return;
	}
	int mid=(l+r)/2;
	build(id*2,l,mid);build(id*2+1,mid+1,r);
	upd(id);
}
void change(int id,int l,int r,int pos,long long val,int ty)
{
	if(l==r)
	{
		if(ty==0){x[l]=val;}
		else{y[l]=val;}
		seg[id].ans=x[l]*y[l]%mod;
		seg[id].mul=x[l];
		seg[id].lgmul=log(x[l]);
		seg[id].lgans=log(x[l])+log(y[l]);
		return;
	}
	int mid=(l+r)/2;
	if(pos<=mid){change(id*2,l,mid,pos,val,ty);}
	else{change(id*2+1,mid+1,r,pos,val,ty);}
	upd(id);
}
int init(int N,int X[],int Y[]){n=N;rep(i,n){x[i+1]=X[i];y[i+1]=Y[i];}build(1,1,n);return seg[1].ans;}
int updateX(int pos,int val){pos++;change(1,1,n,pos,val,0);return seg[1].ans;}
int updateY(int pos,int val){pos++;change(1,1,n,pos,val,1);return seg[1].ans;}

Compilation message (stderr)

horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:65:81: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   65 | int init(int N,int X[],int Y[]){n=N;rep(i,n){x[i+1]=X[i];y[i+1]=Y[i];}build(1,1,n);return seg[1].ans;}
      |                                                                                 ^
horses.cpp:65:98: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   65 | int init(int N,int X[],int Y[]){n=N;rep(i,n){x[i+1]=X[i];y[i+1]=Y[i];}build(1,1,n);return seg[1].ans;}
      |                                                                                           ~~~~~~~^~~
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:66:47: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   66 | int updateX(int pos,int val){pos++;change(1,1,n,pos,val,0);return seg[1].ans;}
      |                                               ^
horses.cpp:66:74: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   66 | int updateX(int pos,int val){pos++;change(1,1,n,pos,val,0);return seg[1].ans;}
      |                                                                   ~~~~~~~^~~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:67:47: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   67 | int updateY(int pos,int val){pos++;change(1,1,n,pos,val,1);return seg[1].ans;}
      |                                               ^
horses.cpp:67:74: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   67 | int updateY(int pos,int val){pos++;change(1,1,n,pos,val,1);return seg[1].ans;}
      |                                                                   ~~~~~~~^~~
horses.cpp: In function 'int read()':
horses.cpp:7:23: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    7 | int read(){int x;scanf("%d",&x);return x;}
      |                  ~~~~~^~~~~~~~~

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