Submission #787765

#	Time	Username	Problem	Language	Result	Execution time	Memory
787765		fabijan_cikac	A Difficult(y) Choice (BOI21_books)	C++17	60 / 100	15 ms	296 KiB

books

#include "books.h"
#include <bits/stdc++.h>
 
using namespace std;
 
#define pp pair<int, ll>
#define F first
#define S second
#define ll long long
#define pb push_back
 
void solve(int N, int K, ll A, int S){
    int l = 1, r = N;
    while (l < r){
        int mid = (l + r - 1) / 2;
        if (skim(mid) >= A)
            r = mid;
        else l = mid + 1;
    }
    vector<pp> v;
    for (int i = 1; i <= min(K, l - K); ++i)
        v.pb({i, skim(i)});
    for (int i = max(K + 1, l - K + 1); i <= l; ++i)
        v.pb({i, skim(i)});
    for (int i = 0; i < (1 << (int)(v.size())); ++i){
        if (__builtin_popcount(i) != K)
            continue;
        ll sum = 0;
        for (int j = 0; j < v.size(); ++j){
            if (i & (1 << j)) sum += v[j].S;
        }
        if (sum >= A && sum <= 2 * A){
            vector<int> ans;
            for (int j = 0; j < v.size(); ++j){
                if (i & (1 << j)) ans.pb(v[j].F);
            }
            sort(ans.begin(), ans.end()); answer(ans);
        }
    }
    impossible();
}

Compilation message (stderr)

books.cpp: In function 'void solve(int, int, long long int, int)':
books.cpp:29:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |         for (int j = 0; j < v.size(); ++j){
      |                         ~~^~~~~~~~~~
books.cpp:34:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |             for (int j = 0; j < v.size(); ++j){
      |                             ~~^~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 15
• Subtask 3: 10 / 10
• Subtask 4: 15 / 15
• Subtask 5: 15 / 15
• Subtask 6: 20 / 20
• Subtask 7: 0 / 20