Submission #652887

#	Time	Username	Problem	Language	Result	Execution time	Memory
652887		lto5	Non-boring sequences (CERC12_D)	C++14	0 / 1	5055 ms	3392 KiB

D

#include <bits/stdc++.h>
using namespace std;

const int N = 2e5 + 5;

template <typename T> inline void read (T &x) {
  char ch;
  while (!isdigit(ch = getchar()) && ch != '-') ;
  bool sign = ch == '-';
  x = isdigit(ch) ? ch - '0' : 0;
  while (isdigit(ch = getchar()))
    x = x * 10 + ch - '0';
  if (sign)
    x = -x;
}

template <typename T> inline void write_pos (T x) {
  if (x > 9) {
    write_pos(x / 10);
  }
  putchar(x % 10 + '0');
}

template <typename T> inline void write (T x) {
  if (x < 0)
    putchar('-'), x = -x;
  write_pos(x);
}

int n;
int a[N];
int b[N];
int cnt[N];

void read_input() {
  read(n);
  for (int i = 1; i <= n; i++) {
    read(a[i]);
    b[i] = a[i];
  }
}

bool boring (int L, int R, int turn = 0) {
  if (L >= R)
    return false;

  for (int i = L; i <= R; i++)
    cnt[a[i]] = 0;
  for (int i = L; i <= R; i++)
    cnt[a[i]]++;

  if (!turn) {
    for (int i = L; i <= R; i++)
      if (cnt[a[i]] == 1)
        return boring(L, i - 1, turn^1) || boring(i + 1, R, turn);
  }

  else {
    for (int i = R; i >= L; i--)
      if (cnt[a[i]] == 1)
        return boring(L, i - 1, turn^1) || boring(i + 1, R, turn);
  }

  return true;
}

void solve() {
  sort(b + 1, b + n + 1);
  for (int i = 1; i <= n; i++) {
    a[i] = lower_bound(b + 1, b + n + 1, a[i]) - b;
    cnt[a[i]] = 0;
  }

  puts(!boring(1, n) ? "non-boring" : "boring");
}

int main() {
  int t;
  read(t);

  while (t--) {
    read_input();
    solve();
  }

  return 0;
}

• Subtask 1: 0 / 1