Submission #651981

#	Time	Username	Problem	Language	Result	Execution time	Memory
651981		lto5	Non-boring sequences (CERC12_D)	C++14	0 / 1	5039 ms	2608 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];
multiset<int> s;

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

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;
  }

  queue <pair <int, int>> qu;
  qu.emplace(1, n);

  bool ok = true;

  while (!qu.empty()) {
    int L = qu.front().first;
    int R = qu.front().second;

    qu.pop();

    if (L > R)
      continue;

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

    int First = -1;
    int Last = -1;

    for (int i = L; i <= R; i++) {
      if (cnt[a[i]] == 1) {
        if (Last != -1)
          qu.push({Last + 1, i - 1});
        Last = i;
        if (First == -1)
          First = i ;
      }
    }

    if (Last == -1) {
      ok = false;
      break;
    }

    qu.push({L, First - 1});
    qu.push({Last + 1, R});

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

  puts(ok ? "non-boring" : "boring");
}

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

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

  return 0;
}

• Subtask 1: 0 / 1