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#include "horses.h"
#include <bits/stdc++.h>
#define rep(i,a,b) for(int i=a; i<int(b); i++)
using namespace std;
int n;
long long x[500000],y[500000];
long long m=1000000000+7;
long long product;
pair<long long,long long> invgcd(long long a, long long b) {
//Returns x and y such that ax+by=1
if (a==1 && b==0) return make_pair(1,0);
long long c=a%b;
long long d=a/b;
pair<long long, long long > ans = invgcd(b,c);
return make_pair(ans.second,ans.first-ans.second*d);
}
long long inverse2(long long a) {
pair<long long, long long > ans = invgcd(m,a);
return ans.second+m;
}
long long powsmart(long long a,long long b) {
if (b==1) return a;
long long x=powsmart(a,b/2);
x=(x*x)%m;
if (b%2==0) {
return x;
}
else
return (a*x)%m;
}
long long inverse( long long a) {
//calculate a**(m-2)
return powsmart(a%m,m-2);
}
int init(int N, int X[], int Y[]) {
n=N;
rep (i,0,n) {
x[i]=X[i];
y[i]=Y[i];
}
product=1;
rep (i,0,n) {
product*=x[i];
product%=m;
}
long long hi=y[n-1];
long long divide=1;
for (int i = n-2; i>=0; i--) {
hi*=x[i+1];
hi=max(hi,y[i]);
divide*=x[i+1];
if (hi>=1000000000) break;
}
long long ans=hi*product;
ans%=m;
ans*=inverse(divide);
ans%=m;
return ans;
}
int updateX(int pos, int val) {
product*=inverse(x[pos]);
product%=m;
product*=val;
x[pos]=val;
long long hi=y[n-1];
long long divide=1;
for (int i = n-2; i>=0; i--) {
hi*=x[i+1];
hi=max(hi,y[i]);
divide*=x[i+1];
if (hi>=1000000000) break;
}
long long ans=hi*product;
ans%=m;
ans*=inverse(divide);
ans%=m;
return ans;
}
int updateY(int pos, int val) {
y[pos]=val;
long long hi=y[n-1];
long long divide=1;
for (int i = n-2; i>=0; i--) {
hi*=x[i+1];
hi=max(hi,y[i]);
divide*=x[i+1];
if (hi>=1000000000) break;
}
long long ans=hi*product;
ans%=m;
ans*=inverse(divide);
ans%=m;
return ans;
}
컴파일 시 표준 에러 (stderr) 메시지
horses.cpp: In function 'long long int powsmart(long long int, long long int)':
horses.cpp:25:13: warning: declaration of 'x' shadows a global declaration [-Wshadow]
long long x=powsmart(a,b/2);
^
horses.cpp:7:11: note: shadowed declaration is here
long long x[500000],y[500000];
^
horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:61:9: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
return ans;
^~~
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:84:9: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
return ans;
^~~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:101:9: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
return ans;
^~~
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