Submission #406190

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
406190	2021-05-17 09:18:35	shenxy	A Difficult(y) Choice (BOI21_books)	C++17	100 / 100	3 ms	272 KiB

books

1
2
3
4
5
6
7
8
9
10
11
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13
14
15
16
17
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19
20
21
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30
#include "books.h"
#include <algorithm>
#include <vector>
using namespace std;
/*long long skim(int i){return i;}
void answer(vector<int> v){}
void impossible(){}*/
void solve(int N, int K, long long A, int S) {
  if (skim(1) > A) impossible();
  int l = 1, r = N;
  while (l != r) {
    if (skim((l + r) / 2 + 1) <= A) l = (l + r) / 2 + 1;
    else r = (l + r) / 2;
  }
  vector<long long> x, pos;
  if (r <= 2 * K) {
    for (int i = 1; i <= r; ++i) pos.push_back(i), x.push_back(skim(i));
  } else {
    for (int i = 1; i <= K; ++i) pos.push_back(i), x.push_back(skim(i));
    for (int i = r - K + 1; i <= r; ++i) pos.push_back(i), x.push_back(skim(i));
  }
  if (r != N && r >= K - 1) {
    long long sum = 0;
    for (int i = 0; i < K - 1; ++i) sum += x[i];
    sum += skim(r + 1);
    if (sum <= 2 * A) {
      vector<int> ans;
      for (int i = 1; i < K; ++i) ans.push_back(i);
      ans.push_back(r + 1);
      answer(ans);
 
 
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Compilation message (stderr)

books.cpp: In function 'void solve(int, int, long long int, int)':
books.cpp:42:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |  for (int i = K; i < x.size(); ++i) {
      |                  ~~^~~~~~~~~~

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