ABC-256

C Union of Interval

$URL\:\to$ https://atcoder.jp/contests/abc256/tasks/abc256_d

#imos法

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  ll LIMIT = 2e5;

  ll n; cin >> n;
  vec<ll> a(LIMIT+1, 0);
  rep(i, 0, n) {
    ll l, r; cin >> l >> r;
    a[l]++; a[r]--;
  }

  rep(i, 0, LIMIT) a[i+1] += a[i];

  ll left = 0;
  bool flg = false;
  rep(i, 0, LIMIT+1) {
    if (a[i] > 0 && !flg) {
      left = i;
      flg = true;
    } else if (a[i] == 0 && flg) {
      flg = false;
      out(left, i);
    }
  }

  return 0;
}

解法

imos法でやるだけ

---

D

$URL\:\to$

解法

---

E

$URL\:\to$

解法

---