Submission #872109

#	Time	Username	Problem	Language	Result	Execution time	Memory
872109		mgl_diamond	Jail (JOI22_jail)	C++17	0 / 100	2 ms	3256 KiB

jail

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ii = pair<int, int>;

#define foru(i, l, r) for(int i=(l); i<=(r); ++i)
#define ford(i, l, r) for(int i=(l); i>=(r); --i)
#define fore(x, v) for(auto &x : v)
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)x.size()
#define file "input"

template<class T> bool maximize(T &a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> bool minimize(T &a, T b) { if (a > b) { a = b; return 1; } return 0; }

void setIO() {
  ios::sync_with_stdio(0);
  cin.tie(0); cout.tie(0);

  if (fopen(file".inp", "r")) {
    freopen(file".inp", "r", stdin);
    freopen(file".out", "w", stdout);
  }
}

const int N = 120002;

int q, n, m;
vector<int> graph[N];

int main() {
  setIO();

  cin >> q;
  while (q--) {
    cin >> n >> m;

    foru(i, 1, n) {
      graph[i].clear();
    }

    foru(i, 2, n) {
      int u, v;
      cin >> u >> v;
      graph[u].push_back(v);
      graph[v].push_back(u);
    }

    vector<ii> pos[2];
    int mn = N, mx = -N;

    foru(i, 1, m) {
      int u, v;
      cin >> u >> v;
      pos[u > v].emplace_back(u, v);
      if (u > v) minimize(mn, v);
      if (u < v) maximize(mx, v);
    }

    sort(all(pos[0]));
    sort(all(pos[1]), greater<ii>());

    // fore(x, pos[0]) cout << x.first << " " << x.second << "\n";

    bool can = 1;
    if (mn < mx) can = 0;

    if (!pos[0].empty() && !pos[1].empty())
      if (pos[0].back() >= pos[1][0])  
        can = 0;

    foru(i, 0, sz(pos[0])-2) 
      if (pos[0][i].second > pos[0][i+1].second) 
        can = 0;

    foru(i, 0, sz(pos[1])-2)
      if (pos[1][i].second < pos[1][i+1].second)
        can = 0;

    cout << (can ? "Yes\n" : "No\n");
  }
}

Compilation message (stderr)

jail.cpp: In function 'void setIO()':
jail.cpp:21:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |     freopen(file".inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
jail.cpp:22:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |     freopen(file".out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 16
• Subtask 4: 0 / 28
• Subtask 5: 0 / 12
• Subtask 6: 0 / 11
• Subtask 7: 0 / 23