Submission #675582

#	Time	Username	Problem	Language	Result	Execution time	Memory
675582		benjaminkleyn	Gondola (IOI14_gondola)	C++17	Compilation error	0 ms	0 KiB

gondola

#include <bits/stdc++.h>
#include "gondola.h"
using namespace std;
typedef long long ll;

unordered_map<int,int> cnt;
int valid(int n, int inputSeq[])
{
    cnt.clear();
    for (int i = 0; i < n; i++)
    {
        cnt[inputSeq[i]]++;
        if (cnt[inputSeq[i]] > 1)
            return 0;
    }
    int startPos = -1;
    for (int i = 0; i < n; i++)
        if (inputSeq[i] <= n)
        {
            startPos = (i - inputSeq[i] + 1 + n) % n;
            break;
        }
    if (startPos == -1)
        return 1;
    for (int i = 0; i < n; i++)
        if (inputSeq[i] <= n && startPos != (i - inputSeq[i] + 1 + n) % n)
            return 0;
    return 1;
}

int replacement(int n, int gondolaSeq[], int replacementSeq[])
{
    vector<pair<int,int>> r;
    int startPos = 0;
    for (int i = 0; i < n; i++)
        if (gondolaSeq[i] > n)
            r.push_back({gondolaSeq[i], i});
        else
            startPos = (i - gondolaSeq[i] + 1 + n) % n;

    sort(r.begin(), r.end());

    int l = 0;
    int cur_mx = n;
    for (auto [newval, idx] : r)
    {
        int oldval = 1 + (idx - startPos + n) % n;
        while (oldval != newval)
        {
            replacementSeq[l++] = oldval;
            oldval = ++cur_mx;
        }
    }

    return l;
}

const ll mod = 1000000009;

int countReplacement(int n, int inputSeq[])
{
    if (!valid(n, inputSeq))
        return 0;

    vector<pair<int,int>> r;
    int startPos = -1;
    for (int i = 0; i < n; i++)
        if (gondolaSeq[i] > n)
            r.push_back({gondolaSeq[i], i});
        else
            startPos = (i - gondolaSeq[i] + 1 + n) % n;

    if (startPos == -1)
        return 0; // for now this is too complicated

    sort(r.begin(), r.end());

    ll res = 1;
    int cur_mx = n;
    for (auto [newval, idx] : r)
    {
        int oldval = 1 + (idx - startPos + n) % n;
        // basically, seq[i] = ++cur_mx for some i until cur_mx = newval - 1.
        // and then seq[idx] = ++cur_mx.
        //
        // the first one happens (newval - 1) - cur_mx times
        // and the last one is fixed.
    }

    return res;
}

Compilation message (stderr)

gondola.cpp: In function 'int countReplacement(int, int*)':
gondola.cpp:68:13: error: 'gondolaSeq' was not declared in this scope
   68 |         if (gondolaSeq[i] > n)
      |             ^~~~~~~~~~
gondola.cpp:69:43: error: no matching function for call to 'std::vector<std::pair<int, int> >::push_back(<brace-enclosed initializer list>)'
   69 |             r.push_back({gondolaSeq[i], i});
      |                                           ^
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 gondola.cpp:1:
/usr/include/c++/10/bits/stl_vector.h:1187:7: note: candidate: 'void std::vector<_Tp, _Alloc>::push_back(const value_type&) [with _Tp = std::pair<int, int>; _Alloc = std::allocator<std::pair<int, int> >; std::vector<_Tp, _Alloc>::value_type = std::pair<int, int>]'
 1187 |       push_back(const value_type& __x)
      |       ^~~~~~~~~
/usr/include/c++/10/bits/stl_vector.h:1187:35: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'const value_type&' {aka 'const std::pair<int, int>&'}
 1187 |       push_back(const value_type& __x)
      |                 ~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/stl_vector.h:1203:7: note: candidate: 'void std::vector<_Tp, _Alloc>::push_back(std::vector<_Tp, _Alloc>::value_type&&) [with _Tp = std::pair<int, int>; _Alloc = std::allocator<std::pair<int, int> >; std::vector<_Tp, _Alloc>::value_type = std::pair<int, int>]'
 1203 |       push_back(value_type&& __x)
      |       ^~~~~~~~~
/usr/include/c++/10/bits/stl_vector.h:1203:30: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'std::vector<std::pair<int, int> >::value_type&&' {aka 'std::pair<int, int>&&'}
 1203 |       push_back(value_type&& __x)
      |                 ~~~~~~~~~~~~~^~~
gondola.cpp:82:13: warning: unused variable 'oldval' [-Wunused-variable]
   82 |         int oldval = 1 + (idx - startPos + n) % n;
      |             ^~~~~~
gondola.cpp:79:9: warning: unused variable 'cur_mx' [-Wunused-variable]
   79 |     int cur_mx = n;
      |         ^~~~~~