Submission #67708

#	Time	Username	Problem	Language	Result	Execution time	Memory
67708		chpipis	Xylophone (JOI18_xylophone)	C++11	Compilation error	0 ms	0 KiB

xylophone

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

using namespace std;

const int MAXN = 5005;

int ar[MAXN];

void detect_pitch(int n) {
	memset(ar, -1, sizeof ar);
	
	ar[0] = 0;
	ar[1] = ask(0, 1);

	for (int i = 1; i + 1 < n; i++) {
		int a = ar[i], b = ar[i - 1];
		int one = ask(i, i + 1);
		int two = ask(i - 1, i + 1);
		if (a < b) {
			if (a - one + two == b)
				ar[i + 1] = a - one;
			else
				ar[i + 1] = a + one;
		} else {
			if (a + one - two == b)
				ar[i + 1] = a + one;
			else
				ar[i + 1] = a - one;
		}
	}

	for (int i = 0; i < n; i++) {
		for (int j = i + 1; j < n; j++) {
			if (abs(ar[i] - ar[j]) != n - 1)
				continue;
			int add = 0 - min(ar[i], ar[j]);
			for (int k = 0; k < n; k++) {
				ar[k] += add;
			}
			if (ar[i] > ar[j]) {
				for (int k = 0; k < n; k++) {
					ar[k] = n - 1 - ar[k];
				}
			}
		}
	}

	for (int i = 0; i < n; i++) {
		answer(i, ar[i]);
	}
}

Compilation message (stderr)

xylophone.cpp: In function 'void detect_pitch(int)':
xylophone.cpp:14:10: error: 'ask' was not declared in this scope
  ar[1] = ask(0, 1);
          ^~~