Submission #1018799

#	Time	Username	Problem	Language	Result	Execution time	Memory
1018799		overwatch9	A Difficult(y) Choice (BOI21_books)	C++17	0 / 100	1 ms	1112 KiB

books

#include <bits/stdc++.h>

#include "books.h"
 
using namespace std;
using ll = long long;
//
// --- Sample implementation for the task books ---
//
// To compile this program with the sample grader, place:
//     books.h books_sample.cpp sample_grader.cpp
// in a single folder and run:
//     g++ books_sample.cpp sample_grader.cpp
// in this folder.
//


// vector <int> NUMS;
// ll skim(int x) {
//     return NUMS[x];
// }

void solve(int N, int K, ll A, int S) {
    vector <int> ans(K+1);
    ll sum = 0;
    vector <ll> nums(N+1);
    for (int i = 1; i <= K; i++) {
        nums[i] = skim(i);
        sum += nums[i];
        ans[i] = i;
    }
    if (sum > 2*A) {
        impossible();
        return;
    }
    int lo = 1, hi = N+1;
    int lst = 0;
    while (lo < hi) {
        int mid = lo + (hi - lo) / 2;
        if (nums[mid] == 0)
            nums[mid] = skim(mid);
        if (nums[mid] > A)
            hi = mid;
        else
            lo = mid+1;
    }
    if (lo < K) {
        impossible();
        return;
    }
    if (nums[lo] != 0)
        nums[lo] = skim(lo);
    if (nums[lo] + sum - nums[K] >= A && nums[lo] + sum - nums[K] <= 2 * A){
        ans[K] = lo;
        vector <int> ans2(K);
        for (int i = 0; i < K; i++)
            ans2[i] = ans[i+1];
        answer(ans2);
        return;
    }
    lst = lo-1;
    for (int i = K, pt2 = K, pt = lst; i >= 1 && sum < A && pt > i; i--, pt--) {
        sum -= nums[pt2];
        if (nums[pt] == 0)
            nums[pt] = skim(pt);
        if (sum + nums[pt] <= 2 * A) {
            sum += nums[pt];
            ans[i] = pt;
            pt2--;
        } else {
            sum += nums[pt2];
        }
    }
    if (sum < A || sum > 2 * A) {
        impossible();
        return;
    }
    vector <int> ans2(K);
    for (int i = 0; i < K; i++)
        ans2[i] = ans[i+1];
    answer(ans2);

}
// int main() {
//     int n, k, a, s;
//     cin >> n >> k >> a >> s;
//     NUMS.resize(n+1);
//     for (int i = 1; i <= n; i++)
//         cin >> NUMS[i];
//     solve(n, k, a, s);
// }

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