Submission #121839

#	Time	Username	Problem	Language	Result	Execution time	Memory
121839		turbat	Sails (IOI07_sails)	C++14	80 / 100	1061 ms	3840 KiB

sails

#include <bits/stdc++.h>
using namespace std;
#define N 100005

int n, mh;
long long  sum, cnt[N], s[N], ans, p, uld, avr;
pair <int, int> mast[N];

void solve (int l){
  if (l > mh) return;
  p = l;
  // cout << l<< endl;
  long long th = mh;
  for (int i = l;i <= mh;i++)
    if((s[i] - s[l - 1]) * (p - l + 1) >= (s[p] - s[l - 1]) * (i - l + 1)){
      p = i;
      th = ((s[th] - s[l - 1]) * (i - l + 1)) / (s[i] - s[l - 1]); 
    }
  sum = s[p] - s[l - 1];
  avr = sum / (p - l + 1);
  uld = sum % (p - l + 1);
  ans += uld * avr;
  ans += (p - l + 1) * avr * (avr - 1) / 2;
  solve (p + 1);
}

int main (){
  ios_base::sync_with_stdio(NULL);
  cin.tie(NULL);
  cin >> n;
  for (int i = 0;i < n;i++){
    cin >> mast[i].first>> mast[i].second;
    mh = max(mh, mast[i].first);
    cnt[mast[i].first + 1]--;
    cnt[mast[i].first - mast[i].second + 1]++;
  }
  p = 1;
  for (int i = 1;i <= mh;i++) { 
    cnt[i] += cnt[i - 1];
    s[i] = s[i - 1] + cnt[i];
    if(s[i] * p >= s[p] * i)
      p = i;
  }
  avr = s[p] / p;
  uld = s[p] % p;
  ans += uld * avr;
  ans += p * avr * (avr - 1) / 2;
  solve (p + 1);
  cout << ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 5 / 5
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 0 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 0 / 10
• Subtask 11: 10 / 10