Submission #1083905

#	Time	Username	Problem	Language	Result	Execution time	Memory
1083905		May27_th	Art Exhibition (JOI18_art)	C++17	0 / 100	1 ms	348 KiB

art

#include<bits/stdc++.h>
 
using namespace std;
 
#define i64 long long
#define mp make_pair
#define pb push_back
#define all(x) (x).begin(), (x).end()
struct Tree{
  int n;
  vector<int64_t>lazy;
  vector<int64_t>st;
  Tree(int _n, int64_t _v): n(_n), st(_n * 4, _v), lazy(_n * 4, _v){};
  void push(int id){
    int64_t add = lazy[id];
    lazy[id * 2] += add, st[id * 2] += add;
    lazy[id * 2 + 1] += add, st[id * 2 + 1] += add;
    lazy[id] = 0;
  }
  void update(int id, int l, int r, int u, int v, int64_t val){
    if (v < l || u > r) return;
    if (u <= l && r <= v) {
      st[id] += val;
      // lazy[id] += val;
      return;
    }
    // push(id);
    int mid = (l + r)/2;
    update(id * 2, l, mid, u, v, val);
    update(id * 2 + 1, mid + 1, r, u, v, val);
    st[id] = max(st[id * 2], st[id * 2 + 1]);
  }
  i64 get(int id, int l, int r, int u, int v) {
    if (v < l || u > r) return 0;
    if (u <= l && r <= v) return st[id];
    int mid = (l + r)/2;
    return max(get(id * 2, l, mid, u, v), get(id * 2 + 1, mid + 1, r, u, v));
  }
};
void Solve(void) {
  int N; cin >> N;
  Tree sum(N + 5, 0);
  vector<pair<i64, i64>> pictures(N);
  vector<i64> pref(N + 2, 0);
  for (int i = 0; i < N; i ++) {
    cin >> pictures[i].first >> pictures[i].second;
  }  
  sort(all(pictures));
  for (int i = 0; i < N; i ++) {
    pref[i + 1] = pref[i] + pictures[i].second;
    sum.update(1, 1, N, i + 1, i + 1, pref[i + 1] - pictures[i].first);
  }
  i64 ans = 0;
  for (int i = 1; i <= N; i ++) {
    ans = max(ans, sum.get(1, 1, N, i, N) - pref[i - 1] + pictures[i - 1].first);
  }
  cout << ans << "\n";
}
signed main() {
  ios_base::sync_with_stdio(false); cin.tie(0);
  int Tests = 1; // cin >> Tests; 
  while (Tests --) {
    Solve();    
  }
}

Compilation message (stderr)

art.cpp: In constructor 'Tree::Tree(int, int64_t)':
art.cpp:12:18: warning: 'Tree::st' will be initialized after [-Wreorder]
   12 |   vector<int64_t>st;
      |                  ^~
art.cpp:11:18: warning:   'std::vector<long int> Tree::lazy' [-Wreorder]
   11 |   vector<int64_t>lazy;
      |                  ^~~~
art.cpp:13:3: warning:   when initialized here [-Wreorder]
   13 |   Tree(int _n, int64_t _v): n(_n), st(_n * 4, _v), lazy(_n * 4, _v){};
      |   ^~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 50