Submission #639827

#	Time	Username	Problem	Language	Result	Execution time	Memory
639827		ghostwriter	Sure Bet (CEOI17_sure)	C++14	100 / 100	96 ms	6756 KiB

sure

#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
#include <debug.h>
#endif
#define st first
#define nd second
#define pb push_back
#define pf push_front
#define _pb pop_back
#define _pf pop_front
#define lb lower_bound
#define ub upper_bound
#define mtp make_tuple
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
typedef long long ll; typedef unsigned long long ull;
typedef double db; typedef long double ldb;
typedef pair<int, int> pi; typedef pair<ll, ll> pll;
typedef vector<int> vi; typedef vector<ll> vll; typedef vector<pi> vpi; typedef vector<pll> vpll;
typedef string str;
template<typename T> T gcd(T a, T b) { return (b == 0? a : gcd(b, a % b)); }
template<typename T> T lcm(T a, T b) { return a / gcd(a, b) * b; }
#define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
#define FOS(i, r, l) for (int (i) = (r); (i) >= (l); --(i))
#define EACH(i, x) for (auto &(i) : (x))
#define WHILE while
#define file "TEST"
mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
ll rand(ll l, ll r) { return uniform_int_distribution<ll>(l, r)(rd); }
/*
    Tran The Bao
    CTL - Da Lat
    Cay ngay cay dem nhung deo duoc cong nhan
*/
const int N = 1e5 + 5;
int n;
ldb a[N], b[N], f[N], rs = 0, sum = 0;
signed main() {
    ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    // freopen(file".inp", "r", stdin);
    // freopen(file".out", "w", stdout);
    cin >> n;
    FOR(i, 1, n) cin >> a[i] >> b[i];
    sort(a + 1, a + 1 + n, greater<ldb>());
    sort(b + 1, b + 1 + n, greater<ldb>());
    FOR(i, 1, n) f[i] = f[i - 1] + b[i];
    FOR(i, 0, n) {
    	sum += a[i];
    	int l = 0, r = n;
    	WHILE(l <= r) {
    		int mid = l + (r - l) / 2;
    		ldb p1 = sum - i - mid, p2 = f[mid] - i - mid;
    		rs = max(rs, min(p1, p2));
    		if (p2 < p1) l = mid + 1;
    		else r = mid - 1;
    	}
    }
    cout << setprecision(4) << fixed << rs;
    return 0;
}

Compilation message (stderr)

sure.cpp: In function 'int main()':
sure.cpp:24:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   24 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
sure.cpp:44:5: note: in expansion of macro 'FOR'
   44 |     FOR(i, 1, n) cin >> a[i] >> b[i];
      |     ^~~
sure.cpp:24:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   24 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
sure.cpp:47:5: note: in expansion of macro 'FOR'
   47 |     FOR(i, 1, n) f[i] = f[i - 1] + b[i];
      |     ^~~
sure.cpp:24:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   24 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
sure.cpp:48:5: note: in expansion of macro 'FOR'
   48 |     FOR(i, 0, n) {
      |     ^~~

• Subtask 1: 20 / 20
• Subtask 2: 40 / 40
• Subtask 3: 40 / 40