Submission #883016

#	Time	Username	Problem	Language	Result	Execution time	Memory
883016		vjudge1	Exhibition (JOI19_ho_t2)	C++17	0 / 100	1 ms	6492 KiB

joi2019_ho_t2

/* Author : Mychecksdead  */
#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define pb push_back
#define all(x) x.begin(), x.end()
#define en cout << '\n'
const int N = 1e6+100, M = 1e5+10, K = 52, MX = 30;


int n;
pair<int, int> T[N];
ll S[N];
array<ll, 2> a[N];
array<ll, 3> b[N];
void build(int x, int m){
  for(int i = 0; i <= 4*x; ++i) T[i] = {0, m+1};
}
pair<int, int> get(int l, int r, int p, int k){
  if(l == r) return T[k];
  int m = l+r>>1;
  if(p <= m) return max(get(l, m, p, k<<1), T[k]);
  return max(get(m+1, r, p, k<<1|1) , T[k]);
}
void update(int l, int r, int ql, int qr, int k, pair<int, int> val){
  if(ql > r || l > qr) return;
  if(ql <= l && r <= qr){
    T[k] = max(T[k], val);
    return;
  }
  int m = l+r>>1;
  update(l, m, ql, qr, k<<1, val);
  update(m+1, r, ql, qr, k<<1|1, val);
}

int m;
void solve(){
  cin >> n >> m;
  for(int i = 1; i <= n; ++i) cin >> a[i][0] >> a[i][1];
  for(int i = 1; i <= n; ++i) b[i][0] = a[i][1], b[i][1] = a[i][0], b[i][2] = i;
  for(int i = 1; i <= m; ++i) cin >> S[i];
  sort(S+1, S+1+m);
  sort(a+1, a+1+n);
  sort(b+1, b+1+n);
  vector<int> val;
  // for(int i = 1; i <= n; ++i) val.pb(a[i][1]);
  // sort(all(val));
  for(int i = 1; i <= n; ++i) a[b[i][2]][1] = i;
  build(n, m);

  for(int i = n; i >= 1; --i){
    int pos = lower_bound(S+1,S+1+m,a[i][0]) - S;
    pair<int, int> dp = get(1, n, a[i][1], 1);
    if(dp.second - 1 < pos) continue;
    if(dp.second > 1 && pos >= 1 && a[i][0] <= S[m] && a[i][0] <= S[max(dp.second - 1, pos)]){
      // cout << dp.first << '\n';
      update(1, n, 1, a[i][1], 1, {dp.first + 1, max(pos, dp.second - 1)});
    }
  }
  int ans = 0;
  for(int i = 1; i <= n; ++i) ans = max(ans, get(1, n, i, 1).first);
  cout << ans; 
}


int main(){
  cin.tie(0); ios::sync_with_stdio(0);
  int tt = 1, aa;
  // freopen("in.txt", "r", stdin);
  // freopen("out.txt", "w", stdout);
  while(tt--){
    solve();
    en;
  }
  cerr<<"time taken : "<<(float)clock()/CLOCKS_PER_SEC<<" seconds\n";
  return 0;
} 

Compilation message (stderr)

joi2019_ho_t2.cpp: In function 'std::pair<int, int> get(int, int, int, int)':
joi2019_ho_t2.cpp:23:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   23 |   int m = l+r>>1;
      |           ~^~
joi2019_ho_t2.cpp: In function 'void update(int, int, int, int, int, std::pair<int, int>)':
joi2019_ho_t2.cpp:33:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   33 |   int m = l+r>>1;
      |           ~^~
joi2019_ho_t2.cpp: In function 'int main()':
joi2019_ho_t2.cpp:70:15: warning: unused variable 'aa' [-Wunused-variable]
   70 |   int tt = 1, aa;
      |               ^~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 40
• Subtask 3: 0 / 50