Submission #946986

#	Time	Username	Problem	Language	Result	Execution time	Memory
946986		Nika533	Horses (IOI15_horses)	C++17	17 / 100	41 ms	10324 KiB

horses

#pragma GCC diagnostic warning "-std=c++11"
#include <bits/stdc++.h>
#include "horses.h"
#define pb push_back
#define f first
#define s second
#define MOD 1000000007
#define flush fflush(stdout)
#define all(x) (x).begin(),(x).end()
#define allr(x) (x).rbegin(), (x).rend()
#define pii pair<int,int>
using namespace std;
const int N=5e5+5;
int n,m,T,k,arr[N],x[N],y[N];

int power(int a, int b) {
	int res=1;
	while (b) {
		if (b%2) {
			res*=a; res%=MOD;
		}
		b/=2;
		a*=a; a%=MOD;
	}
	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];
	}
	arr[0]=x[0];
	for (int i=1; i<n; i++) {
		arr[i]=arr[i-1]*x[i];
		arr[i]%=MOD;
	}
	for (int i=0; i<n; i++) {
		arr[i]*=y[i];
		arr[i]%=MOD;
	}
	
	int ind=n-1;
	int num=1e9;
	long long p=1;
	for (int i=n-1; i>=0; i--) {
		p*=x[i];
		if (p<=num) ind=i;
		else break;
	}
	long long mx=0,idx;
	long long a=1;
	for (int i=ind; i<n; i++) {
		a*=x[i];
		if (a*y[i]>mx) {
			idx=i;
			mx=a*y[i];
		}
	}
	return arr[idx];
}

int updateX(int pos, int val) {
	for (int i=max(pos,n-35); i<n; i++) {
		arr[i]*=val; arr[i]%=MOD;
		//arr[i]/=x[pos];
		arr[i]*=power(x[pos],MOD-2); arr[i]%=MOD;
	}
	x[pos]=val;
	
	int ind=n-1;
	int num=1e9;
	long long p=1;
	for (int i=n-1; i>=0; i--) {
		p*=x[i];
		if (p<=num) ind=i;
		else break;
	}
	long long mx=0,idx;
	long long a=1;
	for (int i=ind; i<n; i++) {
		a*=x[i];
		if (a*y[i]>mx) {
			idx=i;
			mx=a*y[i];
		}
	}
	return arr[idx];
}

int updateY(int pos, int val) {
	arr[pos]*=val; arr[pos]%=MOD;
	//arr[pos]/=y[pos];
	arr[pos]*=power(y[pos],MOD-2); arr[pos]%=MOD;
	y[pos]=val;
	
	int ind=n-1;
	int num=1e9;
	long long p=1;
	for (int i=n-1; i>=0; i--) {
		p*=x[i];
		if (p<=num) ind=i;
		else break;
	}
	long long mx=0,idx;
	long long a=1;
	for (int i=ind; i<n; i++) {
		a*=x[i];
		if (a*y[i]>mx) {
			idx=i;
			mx=a*y[i];
		}
	}
	return arr[idx];
}

Compilation message (stderr)

horses.cpp:1:32: warning: '-std=c++11' is not an option that controls warnings [-Wpragmas]
    1 | #pragma GCC diagnostic warning "-std=c++11"
      |                                ^~~~~~~~~~~~
horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:28:14: warning: declaration of 'N' shadows a global declaration [-Wshadow]
   28 | int init(int N, int X[], int Y[]) {
      |          ~~~~^
horses.cpp:13:11: note: shadowed declaration is here
   13 | const int N=5e5+5;
      |           ^
horses.cpp:61:16: warning: 'idx' may be used uninitialized in this function [-Wmaybe-uninitialized]
   61 |  return arr[idx];
      |                ^
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:89:16: warning: 'idx' may be used uninitialized in this function [-Wmaybe-uninitialized]
   89 |  return arr[idx];
      |                ^
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:115:16: warning: 'idx' may be used uninitialized in this function [-Wmaybe-uninitialized]
  115 |  return arr[idx];
      |                ^

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