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#include "horses.h"
#include <bits/stdc++.h>
using namespace std;
#define F first
#define S second
#define FOR(i,a,b) for (auto i = (a); i <= (b); ++i)
#define NFOR(i,a,b) for(auto i = (a); i >= (b); --i)
#define all(x) (x).begin(), (x).end()
#define sz(x) lli(x.size())
#define mp(i,a) make_pair(i,a)
#define pb(a) push_back(a)
#define bit(x,b) (x&(1LL<<b))
typedef long long int lli;
typedef pair <lli,lli> ii;
typedef pair <lli,ii> iii;
typedef vector <lli> vi;
lli segt[2000001],lazy[2000001],arr1[5000001],arr2[500001];
lli n,mod=1000000007;
lli p(lli a)
{
lli b=0,ans=1;
while((1LL<<b)<=mod-2)
{
if(bit(mod-2,b))
ans=(ans*a)%mod;
a=(a*a)%mod;
b++;
}
return ans;
}
void up(lli node,lli l,lli r,lli s,lli e,lli v)
{
if(l>e||r<s)
return;
if(lazy[node]!=1)
{
segt[node]=(segt[node]*lazy[node])%mod;
if(l!=r)
{
lazy[2*node+1]=(lazy[2*node+1]*lazy[node])%mod;
lazy[2*node+2]=(lazy[2*node+2]*lazy[node])%mod;
}
lazy[node]=1;
}
if(l>=s&&r<=e)
{
segt[node]=(segt[node]*v)%mod;
if(l!=r)
{
lazy[2*node+1]=(lazy[2*node+1]*v)%mod;
lazy[2*node+2]=(lazy[2*node+2]*v)%mod;
}
return;
}
lli m=(l+r)/2;
up(2*node+1,l,m,s,e,v);
up(2*node+2,m+1,r,s,e,v);
segt[node]=max(segt[2*node+1],segt[2*node+2]);
}
int init(int N, int X[], int Y[])
{
for(lli i=0;i<=2000001;++i)
{
segt[i]=1;
lazy[i]=1;
}
n=N;
lli cur=(1);
for(lli i=0;i<n;++i)
{
arr1[i]=X[i];
arr2[i]=Y[i];
cur=(cur*X[i]);
up(0,0,n-1,i,i,(cur*Y[i])%mod);
}
return segt[0];
}
int updateX(int pos, int val)
{
lli v=p(arr1[pos]);
v=(v*val)%mod;
arr1[pos]=v;
up(0,0,n-1,pos,n-1,v);
return segt[0];
}
int updateY(int pos, int val)
{
lli v=p(arr2[pos]);
v=(v*val)%mod;
arr2[pos]=v;
up(0,0,n-1,pos,pos,v);
return segt[0];
}
컴파일 시 표준 에러 (stderr) 메시지
horses.cpp: In function 'lli p(lli)':
horses.cpp:26:15: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
26 | if(bit(mod-2,b))
| ~~~^~
horses.cpp:12:19: note: in definition of macro 'bit'
12 | #define bit(x,b) (x&(1LL<<b))
| ^
horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:78:16: warning: conversion from 'lli' {aka 'long long int'} to 'int' may change value [-Wconversion]
78 | return segt[0];
| ~~~~~~^
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:87:16: warning: conversion from 'lli' {aka 'long long int'} to 'int' may change value [-Wconversion]
87 | return segt[0];
| ~~~~~~^
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:95:16: warning: conversion from 'lli' {aka 'long long int'} to 'int' may change value [-Wconversion]
95 | return segt[0];
| ~~~~~~^
horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:66:12: warning: iteration 2000001 invokes undefined behavior [-Waggressive-loop-optimizations]
66 | segt[i]=1;
| ~~~~~~~^~
horses.cpp:64:16: note: within this loop
64 | for(lli i=0;i<=2000001;++i)
| ~^~~~~~~~~
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