Submission #830336

#	Time	Username	Problem	Language	Result	Execution time	Memory
830336		Supersonic	Horses (IOI15_horses)	C++14	37 / 100	137 ms	33372 KiB

horses

#include "horses.h"
#include <bits/stdc++.h>
using namespace std;
typedef unsigned long long ll;
ll h[500001];
ll x[500001];
ll y[500001];
bool subtask3=1;
int n;
ll tree[1048577];
void modify(int k, int x) {
	k += n;
	tree[k] = x;
	for (k /= 2; k >= 1; k /= 2) {
		tree[k] = tree[2*k]*tree[2*k+1];
		tree[k]%=((ll)1e9+7);
	}
}

ll prod(ll a, ll b) {
	a += n; b += n;
	ll s = 1;
	while (a <= b) {
		if (a%2 == 1) {s *= tree[a++];s%=((ll)1e9+7);}
		if (b%2 == 0) {s *= tree[b--];s%=((ll)1e9+7);}
		a /= 2; b /= 2;
	}
	return s;
}

int init(int N, int X[], int Y[]) {
	n=N;
	//if(n<=1000)subtask3=0;
	for(int i=0;i<n;i++){
		x[i]=X[i];
		if(x[i]<2)subtask3=0;
		modify(i,x[i]);
		y[i]=Y[i];
	}
	//if(subtask3)exit(1);
	//cout<<prod(0,2)<<endl;;
	if(!subtask3){
		ll mp=0;ll c=1;
		for(int i=1;i<n;i++){
			c*=x[i];
			if(c>y[mp]||y[i]>y[mp]||c*y[i]>y[mp]){mp=i;c=1;}
		}
		return (prod(0,mp)*y[mp])%((ll)1e9+7);
	}
	else{
		ll mp=n-33;ll c=1;
		for(int i=n-32;i<n;i++){
			c*=x[i];
			if(c>y[mp]||y[i]>y[mp]||c*y[i]>y[mp]){mp=i;c=1;}
		}
		return (prod(0,mp)*y[mp])%((ll)1e9+7);
	}
}
 
int updateX(int pos, int val) {	
	if(!subtask3){
		x[pos]=val;
		modify(pos,val);
		ll mp=0;ll c=1;
		for(int i=1;i<n;i++){
			c*=x[i];
			if(c>y[mp]||y[i]>y[mp]||c*y[i]>y[mp]){mp=i;c=1;}
		}
		return (prod(0,mp)*y[mp])%((ll)1e9+7);
	}
	else{
		x[pos]=val;
		modify(pos,val);
		ll mp=n-33;ll c=1;
		for(int i=n-32;i<n;i++){
			c*=x[i];
			if(c>y[mp]||y[i]>y[mp]||c*y[i]>y[mp]){mp=i;c=1;}
		}
		return (prod(0,mp)*y[mp])%((ll)1e9+7);
	}
	
}
 
int updateY(int pos, int val) {
	if(!subtask3){
		y[pos]=val;
		ll mp=0;ll c=1;
		for(int i=1;i<n;i++){
			c*=x[i];
			if(c>y[mp]||y[i]>y[mp]||c*y[i]>y[mp]){mp=i;c=1;}
		}
		return (prod(0,mp)*y[mp])%((ll)1e9+7);
	}
	else{
		y[pos]=val;
		ll mp=33;ll c=1;
		for(int i=n-32;i<n;i++){
			c*=x[i];
			if(c>y[mp]||y[i]>y[mp]||c*y[i]>y[mp]){mp=i;c=1;}
		}
		return (prod(0,mp)*y[mp])%((ll)1e9+7);
	}
}

Compilation message (stderr)

horses.cpp: In function 'void modify(int, int)':
horses.cpp:11:24: warning: declaration of 'x' shadows a global declaration [-Wshadow]
   11 | void modify(int k, int x) {
      |                    ~~~~^
horses.cpp:6:4: note: shadowed declaration is here
    6 | ll x[500001];
      |    ^
horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:37:15: warning: conversion from 'll' {aka 'long long unsigned int'} to 'int' may change value [-Wconversion]
   37 |   modify(i,x[i]);
      |            ~~~^
horses.cpp:48:28: warning: conversion from 'll' {aka 'long long unsigned int'} to 'int' may change value [-Wconversion]
   48 |   return (prod(0,mp)*y[mp])%((ll)1e9+7);
      |          ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
horses.cpp:56:28: warning: conversion from 'll' {aka 'long long unsigned int'} to 'int' may change value [-Wconversion]
   56 |   return (prod(0,mp)*y[mp])%((ll)1e9+7);
      |          ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:69:28: warning: conversion from 'll' {aka 'long long unsigned int'} to 'int' may change value [-Wconversion]
   69 |   return (prod(0,mp)*y[mp])%((ll)1e9+7);
      |          ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
horses.cpp:79:28: warning: conversion from 'll' {aka 'long long unsigned int'} to 'int' may change value [-Wconversion]
   79 |   return (prod(0,mp)*y[mp])%((ll)1e9+7);
      |          ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:92:28: warning: conversion from 'll' {aka 'long long unsigned int'} to 'int' may change value [-Wconversion]
   92 |   return (prod(0,mp)*y[mp])%((ll)1e9+7);
      |          ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
horses.cpp:101:28: warning: conversion from 'll' {aka 'long long unsigned int'} to 'int' may change value [-Wconversion]
  101 |   return (prod(0,mp)*y[mp])%((ll)1e9+7);
      |          ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~

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