Submission #301956

#	Time	Username	Problem	Language	Result	Execution time	Memory
301956		VEGAnn	Carnival Tickets (IOI20_tickets)	C++14	Compilation error	0 ms	0 KiB

tickets

#include "tickets.h"
#include <bits/stdc++.h>
#define PB push_back
#define sz(x) ((int)x.size())
#define all(x) x.begin(),x.end()
#define i2 array<int,2>
#define i3 array<int,3>
using namespace std;
typedef long long ll;
const int N = 1600;
const ll OO = 1e18;
vector<i3> vc;
ll f[N][N];
int pre[N][N];

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

	vector<vector<int>> answer;

	for (int i = 0; i < n; i++) {
		std::vector<int> row(m);

		fill(all(row), -1);

		answer.push_back(row);
	}

	if (k == m){
        ll ans = 0;

        for (int i = 0; i < n; i++)
        for (int j = 0; j < m; j++)
            vc.PB({a[i][j], i, j});

        sort(all(vc));

        for (int i = 0; i < sz(vc); i++)
            if (i < sz(vc) / 2)
                ans -= vc[i][0];
            else ans += vc[i][0];

        return ans;
	}

    for (int i = 0; i < n; i++)
    for (int j = 0; j <= n; j++)
        f[i][j] = -OO;

    f[0][0] = x[0][m - 1];
    f[0][1] = -x[0][0];

    int n2 = (n >> 1);

    for (int i = 0; i < n - 1; i++)
    for (int cnt = 0; cnt <= n2; cnt++){
        if (f[i][cnt] == -OO) continue;

        if (cnt + 1 <= n2 && f[i][cnt] - x[i + 1][0] > f[i + 1][cnt + 1]){
            f[i + 1][cnt + 1] = f[i][cnt] - x[i + 1][0];
            pre[i + 1][cnt + 1] = cnt;
        }

        if (f[i][cnt] + x[i + 1][m - 1] > f[i + 1][cnt]){
            f[i + 1][cnt] = f[i][cnt] + x[i + 1][m - 1];
            pre[i + 1][cnt] = cnt;
        }
    }

    ll ans = f[n - 1][n2];

    int i = n - 1, j = n2;

    while (i > 0){
        int pr = pre[i][j];

        if (j == pr){
            answer[i][m - 1] = 0;
        } else {
            answer[i][0] = 0;
        }

        j = pr;
        i--;
    }

    if (j == 1){
        answer[0][0] = 0;
    } else {
        answer[0][m - 1] = 0;
    }

    allocate_tickets(answer);

	return ans;
}

Compilation message (stderr)

tickets.cpp: In function 'long long int find_maximum(int, std::vector<std::vector<int> >)':
tickets.cpp:35:20: error: 'a' was not declared in this scope
   35 |             vc.PB({a[i][j], i, j});
      |                    ^
tickets.cpp:35:34: error: no matching function for call to 'std::vector<std::array<int, 3> >::push_back(<brace-enclosed initializer list>)'
   35 |             vc.PB({a[i][j], i, j});
      |                                  ^
In file included from /usr/include/c++/9/vector:67,
                 from tickets.h:1,
                 from tickets.cpp:1:
/usr/include/c++/9/bits/stl_vector.h:1184:7: note: candidate: 'void std::vector<_Tp, _Alloc>::push_back(const value_type&) [with _Tp = std::array<int, 3>; _Alloc = std::allocator<std::array<int, 3> >; std::vector<_Tp, _Alloc>::value_type = std::array<int, 3>]'
 1184 |       push_back(const value_type& __x)
      |       ^~~~~~~~~
/usr/include/c++/9/bits/stl_vector.h:1184:35: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'const value_type&' {aka 'const std::array<int, 3>&'}
 1184 |       push_back(const value_type& __x)
      |                 ~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/9/bits/stl_vector.h:1200:7: note: candidate: 'void std::vector<_Tp, _Alloc>::push_back(std::vector<_Tp, _Alloc>::value_type&&) [with _Tp = std::array<int, 3>; _Alloc = std::allocator<std::array<int, 3> >; std::vector<_Tp, _Alloc>::value_type = std::array<int, 3>]'
 1200 |       push_back(value_type&& __x)
      |       ^~~~~~~~~
/usr/include/c++/9/bits/stl_vector.h:1200:30: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'std::vector<std::array<int, 3> >::value_type&&' {aka 'std::array<int, 3>&&'}
 1200 |       push_back(value_type&& __x)
      |                 ~~~~~~~~~~~~~^~~