Submission #687338

#	Time	Username	Problem	Language	Result	Execution time	Memory
687338		Alcabel	A Difficult(y) Choice (BOI21_books)	C++17	Compilation error	0 ms	0 KiB

books

#include <bits/stdc++.h>
using namspace std;

void solve(int n, int k, long long a, int s) {
    int l = -1, r = n;
    long long found = -1;
    while (r - l > 1) {
        int m = l + (r - l) / 2;
        long long cur = skim(m + 1);
        if (cur >= a) {
            found = cur;
            r = m;
        } else {
            l = m;
        }
    }
    vector<int> ans(k);
    iota(ans.begin(), ans.end(), 1);
    if (r + 1 <= k - 1) {
        impossible();
        return;
    }
    vector<long long> first(k);
    long long sumFirst = 0;
    for (int i = 0; i < k; ++i) {
        first[i] = skim(i + 1);
        sumFirst += first[i];
    }
    if (r != n && sumFirst - first.back() + found <= 2 * a) {
        ans.back() = r + 1;
        answer(ans);
        return;
    }
    n = r;
    vector<long long> last(k);
    long long sumLast = 0;
    for (int i = n - 1; i >= n - k; --i) {
        last[n - 1 - i] = skim(i + 1);
        sumLast += last[n - 1 - i];
    }
    if (sumFirst >= a && sumFirst <= 2 * a) {
        answer(ans);
        return;
    }
    if (sumLast >= a && sumLast <= 2 * a) {
        iota(ans.begin(), ans.end(), n - k + 1);
        answer(ans);
        return;
    }
    if (sumFirst > 2 * a || sumLast < a) {
        impossible();
        return;
    }
    long long sum = sumFirst;
    iota(ans.begin(), ans.end(), 1);
    for (int i = k - 1; sum < a; --i) {
        assert(i >= 0);
        sum -= first[i];
        sum += last[k - 1 - i];
        ans[i] = n - (k - 1 - i);
    }
    answer(ans);
}

Compilation message (stderr)

books.cpp:2:7: error: expected nested-name-specifier before 'namspace'
    2 | using namspace std;
      |       ^~~~~~~~
books.cpp: In function 'void solve(int, int, long long int, int)':
books.cpp:9:25: error: 'skim' was not declared in this scope
    9 |         long long cur = skim(m + 1);
      |                         ^~~~
books.cpp:17:5: error: 'vector' was not declared in this scope
   17 |     vector<int> ans(k);
      |     ^~~~~~
books.cpp:17:5: note: suggested alternatives:
In file included from /usr/include/c++/10/vector:67,
                 from /usr/include/c++/10/functional:62,
                 from /usr/include/c++/10/pstl/glue_algorithm_defs.h:13,
                 from /usr/include/c++/10/algorithm:74,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:65,
                 from books.cpp:1:
/usr/include/c++/10/bits/stl_vector.h:389:11: note:   'std::vector'
  389 |     class vector : protected _Vector_base<_Tp, _Alloc>
      |           ^~~~~~
In file included from /usr/include/c++/10/functional:62,
                 from /usr/include/c++/10/pstl/glue_algorithm_defs.h:13,
                 from /usr/include/c++/10/algorithm:74,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:65,
                 from books.cpp:1:
/usr/include/c++/10/vector:86:13: note:   'std::pmr::vector'
   86 |       using vector = std::vector<_Tp, polymorphic_allocator<_Tp>>;
      |             ^~~~~~
books.cpp:17:12: error: expected primary-expression before 'int'
   17 |     vector<int> ans(k);
      |            ^~~
books.cpp:18:10: error: 'ans' was not declared in this scope; did you mean 'abs'?
   18 |     iota(ans.begin(), ans.end(), 1);
      |          ^~~
      |          abs
books.cpp:18:5: error: 'iota' was not declared in this scope; did you mean 'std::iota'?
   18 |     iota(ans.begin(), ans.end(), 1);
      |     ^~~~
      |     std::iota
In file included from /usr/include/c++/10/numeric:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:84,
                 from books.cpp:1:
/usr/include/c++/10/bits/stl_numeric.h:88:5: note: 'std::iota' declared here
   88 |     iota(_ForwardIterator __first, _ForwardIterator __last, _Tp __value)
      |     ^~~~
books.cpp:20:9: error: 'impossible' was not declared in this scope
   20 |         impossible();
      |         ^~~~~~~~~~
books.cpp:23:12: error: expected primary-expression before 'long'
   23 |     vector<long long> first(k);
      |            ^~~~
books.cpp:26:9: error: 'first' was not declared in this scope
   26 |         first[i] = skim(i + 1);
      |         ^~~~~
books.cpp:26:20: error: 'skim' was not declared in this scope
   26 |         first[i] = skim(i + 1);
      |                    ^~~~
books.cpp:29:30: error: 'first' was not declared in this scope
   29 |     if (r != n && sumFirst - first.back() + found <= 2 * a) {
      |                              ^~~~~
books.cpp:31:9: error: 'answer' was not declared in this scope
   31 |         answer(ans);
      |         ^~~~~~
books.cpp:35:12: error: expected primary-expression before 'long'
   35 |     vector<long long> last(k);
      |            ^~~~
books.cpp:38:9: error: 'last' was not declared in this scope
   38 |         last[n - 1 - i] = skim(i + 1);
      |         ^~~~
books.cpp:38:27: error: 'skim' was not declared in this scope
   38 |         last[n - 1 - i] = skim(i + 1);
      |                           ^~~~
books.cpp:42:9: error: 'answer' was not declared in this scope
   42 |         answer(ans);
      |         ^~~~~~
books.cpp:47:9: error: 'answer' was not declared in this scope
   47 |         answer(ans);
      |         ^~~~~~
books.cpp:51:9: error: 'impossible' was not declared in this scope
   51 |         impossible();
      |         ^~~~~~~~~~
books.cpp:58:16: error: 'first' was not declared in this scope
   58 |         sum -= first[i];
      |                ^~~~~
books.cpp:59:16: error: 'last' was not declared in this scope
   59 |         sum += last[k - 1 - i];
      |                ^~~~
books.cpp:62:5: error: 'answer' was not declared in this scope
   62 |     answer(ans);
      |     ^~~~~~