Submission #837759

#	Time	Username	Problem	Language	Result	Execution time	Memory
837759		danitro	Secret (JOI14_secret)	C++14	100 / 100	412 ms	4492 KiB

secret

#include <bits/stdc++.h>
#include "secret.h"

using namespace std;

#define MAX 1024

int table[25][MAX], n;

void build(int n, int a[], int l, int r, int level)
{
	if(l > r)return;
	if(l == r)
	{
		table[level][l] = a[l];
		return;
	}
	int mid = (l + r) / 2;
	
	table[level][mid + 1] = a[mid + 1];
	for(int i = mid + 2; i <= r; i++)table[level][i] = Secret(table[level][i - 1], a[i]);
	table[level][mid] = a[mid];
	for(int i = mid - 1; i >= l; i--)table[level][i] = Secret(a[i], table[level][i + 1]);
	
	build(n, a, l, mid, level + 1);
	build(n, a, mid + 1, r, level + 1);
	
	return;
}

void Init(int N, int A[])
{
	n = N;
	build(N, A, 0, n - 1, 0);
}

int Query(int L, int R)
{
	
	int l = 0, r = n - 1, mid, lev = 0, opt;
	while(l <= L && R <= r && r - l > 0)
	{
		mid = (l + r) / 2;
		if(L > mid)l = mid + 1;
		else r = mid;
		opt = lev++;
	}
	if(L == R)return table[opt][L];
	return Secret(table[opt][L], table[opt][R]);
}

Compilation message (stderr)

secret.cpp: In function 'int Query(int, int)':
secret.cpp:49:15: warning: 'opt' may be used uninitialized in this function [-Wmaybe-uninitialized]
   49 |  return Secret(table[opt][L], table[opt][R]);
      |         ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100