Submission #203597

#	Time	Username	Problem	Language	Result	Execution time	Memory
203597		mohammad	Horses (IOI15_horses)	C++14	17 / 100	51 ms	16888 KiB

horses

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*/
 
#include<bits/stdc++.h>
#include "horses.h"
using namespace std;
 
typedef long long ll ;
const ll oo = 1e13 ;
const double PI = acos(-1) ;
const ll M = 1e9 + 7  ;
 
ll x[500010] , y[500010] , n;
ll f = 1 , mp[31] ;
 
ll fastpower( ll x , ll n ){
	ll res = 1 ;
	while(n > 0){
		if(n % 2 == 1)
			res = (res * x) % M;
		x = ( x * x ) % M;
		n = n / 2 ;
	}
	return res;
}
 
int init(int N, int X[], int Y[]){
	n = N;
	for(int i = 0 ; i < N ; ++i)x[i] = X[i] , y[i] = Y[i] , f = (x[i] * f) % M;
	ll x1 = 1 , pl = 0 , ans = 1;
	for(int i = max(0ll,n - 31) ; i < N ; ++i){
		x1 *= x[i];
		if(y[pl] < x1 * y[i])
			x1 = 1 ,pl = i ;
		if(i != max(0ll , n - 31))
			mp[i] = (mp[i - 1] * x[i]) % M;
		else mp[i] = x[i];
	}
	ans = f / (mp[N - 1] / mp[pl]);
	return (ans * y[pl]) % M;
}
 
int updateX(int pos, int val){
	ll pr = x[pos];
	f = (f * fastpower(pr , M - 2)) % M;
	f = (f * val) % M;
	x[pos] = val;
	ll x1 = 1 , pl = 0 , ans = 1;
	for(int i = max(0ll,n - 31) ; i < n ; ++i){
		x1 *= x[i];
		if(y[pl] < x1 * y[i])
			x1 = 1 ,pl = i ;
		if(i != max(0ll , n - 31))
			mp[i] = (mp[i - 1] * x[i]) % M;
		else mp[i] = x[i];
	}
	ans = f / (mp[n - 1] / mp[pl]);
	return (ans * y[pl]) % M;
}
 
int updateY(int pos, int val){
	y[pos] = val;
	ll x1 = 1 , pl = 0 , ans = 1;
	for(int i = max(0ll,n - 31) ; i < n; ++i){
		x1 *= x[i];
		if(y[pl] < x1 * y[i])
			x1 = 1 ,pl = i ;
	}
	ans = f / (mp[n - 1] / mp[pl]);
	return (ans * y[pl]) % M;
}

Compilation message (stderr)

horses.cpp: In function 'll fastpower(ll, ll)':
horses.cpp:32:27: warning: declaration of 'n' shadows a global declaration [-Wshadow]
 ll fastpower( ll x , ll n ){
                           ^
horses.cpp:29:28: note: shadowed declaration is here
 ll x[500010] , y[500010] , n;
                            ^
horses.cpp:32:27: warning: declaration of 'x' shadows a global declaration [-Wshadow]
 ll fastpower( ll x , ll n ){
                           ^
horses.cpp:29:4: note: shadowed declaration is here
 ll x[500010] , y[500010] , n;
    ^
horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:47:17: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
  for(int i = max(0ll,n - 31) ; i < N ; ++i){
              ~~~^~~~~~~~~~~~
horses.cpp:56:23: warning: conversion to 'int' from 'll {aka long long int}' may alter its value [-Wconversion]
  return (ans * y[pl]) % M;
         ~~~~~~~~~~~~~~^~~
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:65:17: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
  for(int i = max(0ll,n - 31) ; i < n ; ++i){
              ~~~^~~~~~~~~~~~
horses.cpp:74:23: warning: conversion to 'int' from 'll {aka long long int}' may alter its value [-Wconversion]
  return (ans * y[pl]) % M;
         ~~~~~~~~~~~~~~^~~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:80:17: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
  for(int i = max(0ll,n - 31) ; i < n; ++i){
              ~~~^~~~~~~~~~~~
horses.cpp:86:23: warning: conversion to 'int' from 'll {aka long long int}' may alter its value [-Wconversion]
  return (ans * y[pl]) % M;
         ~~~~~~~~~~~~~~^~~

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