Submission #894031

#	Time	Username	Problem	Language	Result	Execution time	Memory
894031		vovik	Xylophone (JOI18_xylophone)	C++17	11 / 100	8 ms	440 KiB

xylophone

void solve(int N);
int query(int s, int t);
void answer(int i, int a);

#include <bits/stdc++.h>

void solve(int N) {
	std::vector<int> a(N + 1), b(N), c(N - 1);
	for (int i = 1; i < N; ++i) b[i] = query(i, i + 1);
	for (int i = 1; i + 1 < N; ++i) c[i] = query(i, i + 2);
	a[2] = b[1];
	int x = 1;
	for (int i = 3; i <= N; ++i) a[i] = a[i - 1] + (x *= 1 - 2 * (c[i - 2] != b[i - 2] + b[i - 1])) * b[i - 1];
	int mx = std::max_element(a.begin() + 1, a.end() + 1) - a.begin();
	int mn = std::min_element(a.begin() + 1, a.end() + 1) - a.begin();
	if (mn > mx) {
		a[2] = -b[1];
		int x = -1;
		for (int i = 3; i <= N; ++i) a[i] = a[i - 1] + (x *= 1 - 2 * (c[i - 2] != b[i - 2] + b[i - 1])) * b[i - 1];
	}
	int h = *std::min_element(a.begin() + 1, a.end() + 1);
	for (int i = 1; i <= a.size(); ++i) a[i] -= h - 1;
	for (int i = 1; i <= N; ++i) answer(i, a[i]);
}


#ifdef __APPLE__
#include <cstdio>
#include <cstdlib>

static const int N_MAX = 5000;
static const int Q_MAX = 10000;
static int N;
static int A[N_MAX];
static bool used[N_MAX];
static int query_c;
static int answer_c;

int query(int s, int t) {
	if(query_c >= Q_MAX) {
		printf("Wrong Answer\n");
		exit(0);
	}
	query_c++;
	if(!(1 <= s && s <= t && t <= N)) {
		printf("Wrong Answer\n");
		exit(0);
	}
	int mx = 0, mn = N + 1;
	for(int i = s - 1; i < t; i++) {
		if(mx < A[i]) {
			mx = A[i];
		}
		if(mn > A[i]) {
			mn = A[i];
		}
	}
	return mx - mn;
}

void answer(int i, int a) {
	answer_c++;
	if(!(1 <= i && i <= N)) {
		printf("Wrong Answer\n");
		exit(0);
	}
	if(!(1 <= a && a <= N)) {
		printf("Wrong Answer\n");
		exit(0);
	}
	if(used[i - 1]) {
		printf("Wrong Answer\n");
		exit(0);
	}
	if(a != A[i - 1]) {
		printf("Wrong Answer\n");
		exit(0);
	}
	used[i - 1] = true;
}

int main() {
	query_c = 0;
	answer_c = 0;
	if(scanf("%d", &N) != 1) {
		fprintf(stderr, "Error while reading input\n");
		exit(1);
	}
	for(int i = 0; i < N; i++) {
		if(scanf("%d", A + i) != 1) {
			fprintf(stderr, "Error while reading input\n");
			exit(1);
		}
		used[i] = false;
	}
	solve(N);
	if(!(answer_c == N)) {
		printf("Wrong Answer\n");
		exit(0);
	}
	printf("Accepted : %d\n", query_c);
}

#endif

Compilation message (stderr)

xylophone.cpp: In function 'void solve(int)':
xylophone.cpp:22:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |  for (int i = 1; i <= a.size(); ++i) a[i] -= h - 1;
      |                  ~~^~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 0 / 36
• Subtask 3: 0 / 53