Submission #599359

#	Time	Username	Problem	Language	Result	Execution time	Memory
599359		piOOE	JOIRIS (JOI16_joiris)	C++17	0 / 100	1 ms	468 KiB

joiris

#include <bits/stdc++.h>

using namespace std;

using ll = long long;


int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int n, k;
  cin >> n >> k;
  vector<int> a(n), b(n);
  for (int i = 0; i < n; ++i) {
    cin >> a[i];
  }
  b = a;
  for (int &i: b) {
    i &= 1;
  }
  bool yay[2] = {true, true};
  for (int i = 0; i < n;) {
    int j = i;
    while (j < n && b[j] == b[i]) {
      j += 1;
    }
    int len = j - i;
    yay[b[i]] &= (len % 2 == 0);
    i = j;
  }
  vector<pair<int, int>> ans;
  if (yay[0]) {
    int mx = *max_element(a.begin(), a.end());
    if (mx & 1) {
      for (int i = 0; i < n; ++i) {
        while (a[i] + 1 < mx) {
          ans.emplace_back(1, i);
          a[i] += 2;
        }
      }
    } else {
      for (int i = 0; i < n; ++i) {
        while (a[i] < mx) {
          a[i] += 2;
          ans.emplace_back(1, i);
        }
      }
    }
    auto [f, s] = minmax_element(a.begin(), a.end());
    assert(*f + 1 == *s);
    mx = *f;
    int mn = *s;
    for (int i = 0; i < n;) {
      if (b[i] == 1) {
        i += 1;
        continue;
      }
      int j = i;
      while (j < n && b[i] == b[j]) {
        ans.emplace_back(2, j);
        j += 2;
      }
      i = j;
    }
    for (auto [x, y] : ans) {
      cout << x << " " << y + 1 << endl;
    }
  } else if (yay[1]) {
    int mx = *max_element(a.begin(), a.end());
    if (mx & 1) {
      for (int i = 0; i < n; ++i) {
        while (a[i]< mx) {
          ans.emplace_back(1, i);
          a[i] += 2;
        }
      }
    } else {
      for (int i = 0; i < n; ++i) {
        while (a[i] + 1 < mx) {
          a[i] += 2;
          ans.emplace_back(1, i);
        }
      }
    }
    auto [f, s] = minmax_element(a.begin(), a.end());
    assert(*f + 1 == *s);
    mx = *f;
    int mn = *s;
    for (int i = 0; i < n;) {
      b[i] = a[i] - mn;
      if (b[i] == 1) {
        i += 1;
        continue;
      }
      int j = i;
      while (j < n && b[i] == b[j]) {
        ans.emplace_back(2, j);
        j += 2;
      }
      i = j;
    }
    for (auto [x, y] : ans) {
      cout << x << " " << y + 1 << endl;
    }
  } else {
    cout << -1;
  }
  return 0;
}

Compilation message (stderr)

joiris.cpp: In function 'int main()':
joiris.cpp:52:9: warning: unused variable 'mn' [-Wunused-variable]
   52 |     int mn = *s;
      |         ^~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 15
• Subtask 3: 0 / 15
• Subtask 4: 0 / 55