Submission #338617

#	Time	Username	Problem	Language	Result	Execution time	Memory
338617		Berted	Secret (JOI14_secret)	C++14	100 / 100	544 ms	8428 KiB

secret

#include "secret.h"
#include <vector>

using namespace std;

int N, res[1001][1001], cnt = 0;
vector<int> A;

void build(int L, int R)
{
	if (L < R)
	{
		int M = L + R >> 1;
		build(L, M);
		build(M + 1, R);
		res[M][M] = A[M]; res[M + 1][M + 1] = A[M + 1];
		for (int i = M - 1; i >= L; i--) {cnt++; res[i][M] = Secret(A[i], res[i + 1][M]);}
		for (int i = M + 2; i <= R; i++) {cnt++; res[M + 1][i] = Secret(res[M + 1][i - 1], A[i]);}
		//cerr << "B: " << L << " " << R << " " << cnt << "\n";
	}
}

int qry(int L, int R, int l, int r)
{
	if (l == r) {return A[l];}
	else if (L < R)
	{
		int M = L + R >> 1;
		
		if (r <= M) {return qry(L, M, l, r);}
		else if (l > M) {return qry(M + 1, R, l, r);}
		else 
		{
			//cerr << "Q:" << L << " " << l << " " << R << " " << r << " " << M << " " << res[l][M] << " " << res[M + 1][r] << "\n";
			return Secret(res[l][M], res[M + 1][r]);
		}
	}
}

void Init(int N, int A[]) 
{
  	::N = N;
  	for (int i = 0; i < N; i++) {::A.push_back(A[i]);}
  	build(0, N - 1);
}

int Query(int L, int R) 
{
  	return qry(0, N - 1, L, R);
}

Compilation message (stderr)

secret.cpp: In function 'void build(int, int)':
secret.cpp:13:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   13 |   int M = L + R >> 1;
      |           ~~^~~
secret.cpp: In function 'int qry(int, int, int, int)':
secret.cpp:28:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   28 |   int M = L + R >> 1;
      |           ~~^~~
secret.cpp:38:1: warning: control reaches end of non-void function [-Wreturn-type]
   38 | }
      | ^

• Subtask 1: 100 / 100