Submission #564068

#	Time	Username	Problem	Language	Result	Execution time	Memory
564068		hoanghq2004	Sure Bet (CEOI17_sure)	C++14	100 / 100	85 ms	3660 KiB

sure

#include <bits/stdc++.h>
 
using namespace std;
 
const int N = 1e5 + 10;
 
int n;
double a[N], b[N], ans = -1e9;
 
double calc(int i, int j) {
    return min(a[i], b[j]) - i - j;
}
 
void divide(int L, int R, int from, int to) {
    if (L > R) return;
    int mid = L + R >> 1;
    double cur = -1e9;
    int best = from;
    for (int i = from; i <= to; ++i) {
        if (calc(mid, i) > cur) {
            cur = calc(mid, i);
            best = i;
        }
    }
    ans = max(ans, cur);
    divide(L, mid - 1, from, best);
    divide(mid + 1, R, best, to);
}
 
int main() {
    ios :: sync_with_stdio(0); cin.tie(0);
    cin >> n;
    for (int i = 1; i <= n; ++i) cin >> a[i] >> b[i];
    sort(a + 1, a + n + 1);
    reverse(a + 1, a + n + 1);
    sort(b + 1, b + n + 1);
    reverse(b + 1, b + n + 1);
    for (int i = 1; i <= n; ++i) a[i] += a[i - 1], b[i] += b[i - 1];
    divide(0, n, 0, n);
    cout << setprecision(4) << fixed << ans;
}

Compilation message (stderr)

sure.cpp: In function 'void divide(int, int, int, int)':
sure.cpp:16:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   16 |     int mid = L + R >> 1;
      |               ~~^~~

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