Submission #987249

#	Time	Username	Problem	Language	Result	Execution time	Memory
987249		VMaksimoski008	A Difficult(y) Choice (BOI21_books)	C++17	45 / 100	2 ms	852 KiB

books

#include <bits/stdc++.h>
#include "books.h"

using namespace std;
using ll = long long;
using ull = unsigned long long;

map<int, ull> memo;

ull ask(int p) {
    if(memo.count(p)) return memo[p];
    return memo[p] = skim(p);
}

void solve(int N, int K, ll A, int S) {
    int l=1, r=N-K+1;
    while(l <= r) {
        int mid = (l + r) / 2;
        ull sum = 0;
        for(int i=mid; i<=mid+K-1; i++) sum += ask(i);

        if(sum >= A && sum <= 2 * A) {
            vector<int> ans;
            for(int i=mid; i<=mid+K-1; i++) ans.push_back(i);
            answer(ans);
        }

        if(sum < A) l = mid + 1;
        if(sum > 2 * A) r = mid - 1;
    }

    l=K, r=N-K+1;
    int p = -1;

    while(l <= r) {
        int mid = (l + r) / 2;
        if(ask(mid) >= A) p = mid, r = mid - 1;
        else l = mid + 1;
    }

    if(p != -1) {
        ull sum = ask(p);
        for(int i=1; i<=K-1; i++) sum += ask(i);
        if(sum >= A && sum <= 2 * A) {
            vector<int> ans;
            for(int i=1; i<=K-1; i++) ans.push_back(i);
            ans.push_back(p);
            answer(ans);
        }
    }
    
    impossible();
    return ;
}

Compilation message (stderr)

books.cpp: In function 'void solve(int, int, ll, int)':
books.cpp:22:16: warning: comparison of integer expressions of different signedness: 'ull' {aka 'long long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   22 |         if(sum >= A && sum <= 2 * A) {
      |            ~~~~^~~~
books.cpp:22:28: warning: comparison of integer expressions of different signedness: 'ull' {aka 'long long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   22 |         if(sum >= A && sum <= 2 * A) {
      |                        ~~~~^~~~~~~~
books.cpp:28:16: warning: comparison of integer expressions of different signedness: 'ull' {aka 'long long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   28 |         if(sum < A) l = mid + 1;
      |            ~~~~^~~
books.cpp:29:16: warning: comparison of integer expressions of different signedness: 'ull' {aka 'long long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   29 |         if(sum > 2 * A) r = mid - 1;
      |            ~~~~^~~~~~~
books.cpp:37:21: warning: comparison of integer expressions of different signedness: 'ull' {aka 'long long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   37 |         if(ask(mid) >= A) p = mid, r = mid - 1;
      |            ~~~~~~~~~^~~~
books.cpp:44:16: warning: comparison of integer expressions of different signedness: 'ull' {aka 'long long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   44 |         if(sum >= A && sum <= 2 * A) {
      |            ~~~~^~~~
books.cpp:44:28: warning: comparison of integer expressions of different signedness: 'ull' {aka 'long long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   44 |         if(sum >= A && sum <= 2 * A) {
      |                        ~~~~^~~~~~~~

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