Submission #778683

#	Time	Username	Problem	Language	Result	Execution time	Memory
778683		RecursiveCo	Sure Bet (CEOI17_sure)	C++14	0 / 100	0 ms	212 KiB

sure

// CF template, version 3.0

#include <bits/stdc++.h>

using namespace std;

#define improvePerformance ios_base::sync_with_stdio(false); cin.tie(0)
#define getTest int t; cin >> t
#define eachTest for (int _var=0;_var<t;_var++)
#define get(name) int (name); cin >> (name)
#define out(o) cout << (o)
#define getList(cnt, name) vector<int> (name); for (int _=0;_<(cnt);_++) { get(a); (name).push_back(a); }
#define sortl(name) sort((name).begin(), (name).end())
#define rev(name) reverse((name).begin(), (name).end())
#define forto(name, var) for (int (var) = 0; (var) < (name); (var)++)
#define decision(b) if (b){out("YES");}else{out("NO");}

#define int long long int

signed main() {
    improvePerformance;
    get(n);
    out(setprecision(4));
    vector<double> A;
    vector<double> B;
    forto(n, i) {
        double a, b;
        cin >> a >> b;
        A.push_back(a);
        B.push_back(b);
    }
    sortl(A);
    sortl(B);
    rev(A);
    rev(B);
    vector<double> apref;
    vector<double> bpref;
    apref.push_back(0);
    bpref.push_back(0);
    forto(n, i) {
        apref.push_back(apref.back() + A[i]);
        bpref.push_back(bpref.back() + B[i]);
    }
    double ans = 0;
    for (int b = 1; b <= 2 * n; b++) {
        int l = 0;
        int r = min(b, n);
        double cur = 0;
        while (r - l >= 1) {
            int middle = (l + r) / 2;
            double asum = apref[middle];
            double bsum = bpref[b - middle];
            if (asum <= bsum) l = middle + 1;
            else r = middle;
        }
        if (bpref[b - l] <= apref[l]) cur = max(cur, bpref[b - l]);
        cur = max(cur, apref[l - 1]);
        ans = max(ans, cur - (double) (b));
    }
    out(ans);
}

Compilation message (stderr)

sure.cpp: In function 'int main()':
sure.cpp:10:23: warning: unnecessary parentheses in declaration of 'n' [-Wparentheses]
   10 | #define get(name) int (name); cin >> (name)
      |                       ^
sure.cpp:22:5: note: in expansion of macro 'get'
   22 |     get(n);
      |     ^~~
sure.cpp:15:35: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   15 | #define forto(name, var) for (int (var) = 0; (var) < (name); (var)++)
      |                                   ^
sure.cpp:26:5: note: in expansion of macro 'forto'
   26 |     forto(n, i) {
      |     ^~~~~
sure.cpp:15:35: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   15 | #define forto(name, var) for (int (var) = 0; (var) < (name); (var)++)
      |                                   ^
sure.cpp:40:5: note: in expansion of macro 'forto'
   40 |     forto(n, i) {
      |     ^~~~~

• Subtask 1: 0 / 20
• Subtask 2: 0 / 40
• Subtask 3: 0 / 40