Submission #654732

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
654732	2022-11-01T11:57:05 Z	pauloamed	Sure Bet (CEOI17_sure)	C++14	100 / 100	94 ms	6040 KB

sure

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

#define ld double

vector<ld> sa, sb;

ld ternary_search(int lo, int hi, ld a, int b) {
  auto f = [&](int j){
    return min(sb[j], a) - (b + j + 1);
  };

  while (hi - lo > 1){
    int mid = (hi + lo)>>1;
    if (f(mid) > f(mid + 1)) 
      hi = mid;
    else 
      lo = mid; 
  }
  return f(lo + 1);
}

int32_t main(){
  cin.tie(NULL)->sync_with_stdio(false);
  int n; cin >> n;
  vector<ld> a, b;
  for(int i = 0; i < n; ++i){
    ld x, y; cin >> x >> y;
    a.push_back(x);
    b.push_back(y);
  }

  sort(a.rbegin(), a.rend());
  sort(b.rbegin(), b.rend());

  
  for(int i = 0; i < n; ++i){
    sa.push_back(a[i]);
    sb.push_back(b[i]);
    if(i){
      sa[i] += sa[i - 1];
      sb[i] += sb[i - 1];
    }
  }

  for(int i = 0; i < n; ++i){
    for(int j = 0; j < n; ++j){
      ld x = min(sa[i], sb[j]);
      int y = i + j + 2;
    }
  }

  ld ans = 0;
  for(int i = 0; i < n; ++i){
    ans = max(ans, ternary_search(-1, n, sa[i], (i + 1)));
  }
  cout << setprecision(4) << fixed << ans << "\n";
}

Compilation message

sure.cpp: In function 'int32_t main()':
sure.cpp:48:10: warning: unused variable 'x' [-Wunused-variable]
   48 |       ld x = min(sa[i], sb[j]);
      |          ^
sure.cpp:49:11: warning: unused variable 'y' [-Wunused-variable]
   49 |       int y = i + j + 2;
      |           ^

Subtask #1

20.0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	212 KB	Output is correct
2	Correct	0 ms	212 KB	Output is correct
3	Correct	0 ms	212 KB	Output is correct
4	Correct	0 ms	212 KB	Output is correct
5	Correct	0 ms	212 KB	Output is correct
6	Correct	0 ms	212 KB	Output is correct

Subtask #2

40.0 / 40.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	212 KB	Output is correct
2	Correct	0 ms	212 KB	Output is correct
3	Correct	0 ms	212 KB	Output is correct
4	Correct	0 ms	212 KB	Output is correct
5	Correct	0 ms	212 KB	Output is correct
6	Correct	0 ms	212 KB	Output is correct
7	Correct	1 ms	320 KB	Output is correct
8	Correct	1 ms	320 KB	Output is correct
9	Correct	1 ms	212 KB	Output is correct
10	Correct	1 ms	212 KB	Output is correct
11	Correct	1 ms	212 KB	Output is correct
12	Correct	1 ms	340 KB	Output is correct
13	Correct	1 ms	340 KB	Output is correct
14	Correct	1 ms	340 KB	Output is correct
15	Correct	2 ms	340 KB	Output is correct
16	Correct	1 ms	340 KB	Output is correct

Subtask #3

40.0 / 40.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	212 KB	Output is correct
2	Correct	0 ms	212 KB	Output is correct
3	Correct	0 ms	212 KB	Output is correct
4	Correct	0 ms	212 KB	Output is correct
5	Correct	0 ms	212 KB	Output is correct
6	Correct	0 ms	212 KB	Output is correct
7	Correct	1 ms	320 KB	Output is correct
8	Correct	1 ms	320 KB	Output is correct
9	Correct	1 ms	212 KB	Output is correct
10	Correct	1 ms	212 KB	Output is correct
11	Correct	1 ms	212 KB	Output is correct
12	Correct	1 ms	340 KB	Output is correct
13	Correct	1 ms	340 KB	Output is correct
14	Correct	1 ms	340 KB	Output is correct
15	Correct	2 ms	340 KB	Output is correct
16	Correct	1 ms	340 KB	Output is correct
17	Correct	86 ms	5644 KB	Output is correct
18	Correct	85 ms	5556 KB	Output is correct
19	Correct	87 ms	5676 KB	Output is correct
20	Correct	83 ms	5584 KB	Output is correct
21	Correct	94 ms	5920 KB	Output is correct
22	Correct	83 ms	5580 KB	Output is correct
23	Correct	85 ms	5604 KB	Output is correct
24	Correct	86 ms	5644 KB	Output is correct
25	Correct	84 ms	5544 KB	Output is correct
26	Correct	92 ms	6040 KB	Output is correct