Submission #42934

#	Time	Username	Problem	Language	Result	Execution time	Memory
42934		funcsr	Divide and conquer (IZhO14_divide)	C++14	100 / 100	81 ms	23820 KiB

divide

#include <cstdio>
#include <iostream>
#include <algorithm>
#include <string>
#include <cstring>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <cmath>
#include <iomanip>
#include <cassert>
#include <bitset>
using namespace std;

typedef pair<long long, long long> P;
#define rep(i, n) for (int i=0; i<(n); i++)
#define all(c) (c).begin(), (c).end()
#define uniq(c) c.erase(unique(all(c)), (c).end())
#define index(xs, x) (int)(lower_bound(all(xs), x) - xs.begin())
#define _1 first
#define _2 second
#define pb push_back
#define INF 1145141919
#define MOD 1000000007
#define MAX_N (1<<17)
long long seg[MAX_N*2-1];
void update(int k, long long v) {
  k += MAX_N-1;
  seg[k] = max(seg[k], v);
  while (k > 0) {
    k = (k-1)/2;
    seg[k] = max(seg[k*2+1], seg[k*2+2]);
  }
}
long long query(int a, int b, int k=0, int l=0, int r=MAX_N) {
  if (b <= l || r <= a) return 0;
  if (a <= l && r <= b) return seg[k];
  return max(query(a, b, k*2+1, l, (l+r)/2), query(a, b, k*2+2, (l+r)/2, r));
}

int N;
long long X[100000], A[100000], B[100000];

signed main() {
  ios::sync_with_stdio(false); cin.tie(0);
  cin >> N;
  rep(i, N) cin >> X[i] >> A[i] >> B[i];
  rep(i, N-1) A[i+1] += A[i];
  rep(i, N-1) B[i+1] += B[i];
  vector<long long> xs;
  rep(i, N) xs.pb(B[i]-X[i]);
  sort(all(xs)); uniq(xs);
  long long m = 0;
  for (int l=N-1; l>=0; l--) {
    update(index(xs, B[l]-X[l]), A[l]);
    long long border = (l>0?B[l-1]:0)-X[l];
    long long v = query(index(xs, border), MAX_N);
    if (v != 0) m = max(m, v - (l>0?A[l-1]:0));
  }
  cout << m << "\n";
  return 0;
}

• Subtask 1: 17 / 17
• Subtask 2: 31 / 31
• Subtask 3: 52 / 52