oj.uz

Submission #367597

# Submission time Handle Problem Language Result Execution time Memory
367597 2021-02-17T18:01:43 Z Sparky_09 Sure Bet (CEOI17_sure) C++17
100 / 100
 708 ms 2168 KB 
#include "bits/stdc++.h"
using namespace std;
#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define all(x) begin(x), end(x)
#define trav(a, x) for(auto& a : x)
#define sz(x) (int)(x).size()
typedef long long ll;
typedef pair<ll, ll> pii;
typedef vector<ll> vi;
typedef vector<pii> vpi;

template <class T>
void rd(T &x) {
	int sgn = 1;
	char ch;
	x = 0;
	for (ch = getchar(); (ch < '0' || ch > '9') && ch != '-'; ch = getchar()) ;
	if (ch == '-') ch = getchar(), sgn = -1;
	for (; '0' <= ch && ch <= '9'; ch = getchar()) x = x * 10 + ch - '0';
	x *= sgn;
}
template <class T>
void wr(T x) {
	if (x < 0) putchar('-'), wr(-x);
	else if (x < 10) putchar(x + '0');
	else wr(x / 10), putchar(x % 10 + '0');
}

template<class T> bool ckmin(T& a, const T& b) { return a > b ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }

void usaco(string s){
  freopen((s+".in").c_str(), "r", stdin);
  freopen((s+".out").c_str(), "w", stdout);
}

int n;
double ans = 0;
vector<double> A, B;

int main() {
#ifdef LOCAL_DEFINE
	freopen("input.txt", "r", stdin);
#endif
  cin >> n;
  rep(i, 1, n+1){
    double a, b;
    cin >> a >> b;
    A.push_back(a);
    B.push_back(b);
  }
  sort(A.begin(), A.end(), greater<double>());
  sort(B.begin(), B.end(), greater<double>());
  rep(i, 1, n){ A[i] += A[i-1]; B[i] += B[i-1]; }
  rep(i, 1, 2*n+1){
    double l = 0, r = 1e8;
    while(r - l > 1e-5){
      double mid = (l + r)/2;
      int pos1 = lower_bound(A.begin(), A.end(), mid) - A.begin(), pos2 = lower_bound(B.begin(), B.end(), mid) - B.begin();
      if(A.back() >= mid and B.back() >= mid and pos1 + pos2 + 2 <= i) l = mid;
      else r = mid;
    }
    ans = max(ans, l - i);
  }
  printf("%.4f\n", ans);
}

Compilation message

sure.cpp: In function 'void usaco(std::string)':
sure.cpp:33:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   33 |   freopen((s+".in").c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sure.cpp:34:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   34 |   freopen((s+".out").c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 492 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 5 ms 364 KB Output is correct
13 Correct 5 ms 364 KB Output is correct
14 Correct 5 ms 364 KB Output is correct
15 Correct 5 ms 364 KB Output is correct
16 Correct 6 ms 364 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 492 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 5 ms 364 KB Output is correct
13 Correct 5 ms 364 KB Output is correct
14 Correct 5 ms 364 KB Output is correct
15 Correct 5 ms 364 KB Output is correct
16 Correct 6 ms 364 KB Output is correct
17 Correct 686 ms 2136 KB Output is correct
18 Correct 708 ms 2136 KB Output is correct
19 Correct 656 ms 2136 KB Output is correct
20 Correct 627 ms 2136 KB Output is correct
21 Correct 670 ms 2136 KB Output is correct
22 Correct 646 ms 2136 KB Output is correct
23 Correct 653 ms 2136 KB Output is correct
24 Correct 647 ms 2136 KB Output is correct
25 Correct 635 ms 2168 KB Output is correct
26 Correct 671 ms 2136 KB Output is correct