Submission #578774

#	Time	Username	Problem	Language	Result	Execution time	Memory
578774		thiago_bastos	Carnival Tickets (IOI20_tickets)	C++17	Compilation error	0 ms	0 KiB

tickets

#include "tickets.h"
#include <vector>
#include <algorithm>
#include <utility>

long long find_maximum(int k, std::vector<std::vector<int>> x) {
	int n = x.size();
	int m = x[0].size();
	long long prize = 0;

	auto answer = std :: vector<std :: vector<int>>(n, std :: vector<int>(m, -1));

	std :: vector<std :: pair<int, int>> a;
	std :: vector<int> l(n, m), r(n, 0), lo(n, 0), hi(n, m - 1);

	for(int i = 0; i < n; ++i)
		for(int v : x[i])
			a.emplace_back(v, i);

	std :: sort(a.begin(), a.end());

	for(int i = size(a) / 2; i < (int)size(a); ++i) {
		auto [v, k] = a[i];
		++r[k], --l[k];
	}

	for(int j = 0; j < k; ++j) {
		int L = 0, R = 0;

		for(int i = 0; i < n; ++i) {
			if(l[i] && !r[i]) {
				++L, --l[i];	
				prize -= x[i][lo[i]];
				answer[i][lo[i]++] = j;
			} else if(!l[i] && r[i]) {
				++R, --r[i];
				prize += x[i][hi[i]];
				answer[i][hi[i]--] = j;
			}
		}

		vector<std :: pair<int, int>> a;

		for(int i = 0; i < n; ++i) {
			if(l[i] && r[i]) {
				prize += x[i][hi[i]];
				answer[i][hi[i]] = j;
				a.emplace_back(-x[i][lo[i]] - x[i][hi[i]], i);
				--hi[i], --r[i];
			}
		}

		std :: sort(a.rbegin(), a.rend());

		for(int i = 0; i < n / 2 - L; ++i) {
			auto [v, k] = a[i];
			prize += v;
			answer[k][hi[k]++] = -1;
			answer[k][lo[k]++] = j;
			++r[k], --l[k];
		}
	}

	allocate_tickets(answer);

	return prize;
}

Compilation message (stderr)

tickets.cpp: In function 'long long int find_maximum(int, std::vector<std::vector<int> >)':
tickets.cpp:42:3: error: 'vector' was not declared in this scope
   42 |   vector<std :: pair<int, int>> a;
      |   ^~~~~~
tickets.cpp:42:3: note: suggested alternatives:
In file included from /usr/include/c++/10/vector:67,
                 from tickets.h:1,
                 from tickets.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 tickets.h:1,
                 from tickets.cpp:1:
/usr/include/c++/10/vector:86:13: note:   'std::pmr::vector'
   86 |       using vector = std::vector<_Tp, polymorphic_allocator<_Tp>>;
      |             ^~~~~~
tickets.cpp:42:30: error: expected primary-expression before '>' token
   42 |   vector<std :: pair<int, int>> a;
      |                              ^~