Submission #249533

#	Time	Username	Problem	Language	Result	Execution time	Memory
249533		Vimmer	Poklon (COCI17_poklon7)	C++14	Compilation error	0 ms	0 KiB

poklon

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>

//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("-O3")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("fast-math")
//#pragma GCC optimize("no-stack-protector")

#define F first
#define S second
#define sz(x) int(x.size())
#define pb push_back
#define pf push_front
#define N 1000010
#define M ll(1e9 + 7)
#define inf 1e9 + 1e9

using namespace std;
//using namespace __gnu_pbds;

typedef long double ld;
typedef long long ll;
typedef unsigned long long ull;
typedef short int si;
typedef array <int, 6> a6;

//typedef tree <int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

int L[N], R[N];

void tranc(vector <char> &gr, int x)
{
    gr.clear();

    while (x > 0)
    {
        if (x % 2) gr.pb('1');
          else gr.pb('0');

        x /= 2;
    }

    reverse(gr.begin(), gr.end());
}

vector <char> dfs(int &v)
{
    vector <char> l, r;

    if (L[v] < 0) l = dfs(abs(L[v])); else tranc(l, L[v]);

    if (R[v] < 0) r = dfs(abs(R[v])); else tranc(r, R[v]);

    if (sz(l) < sz(r)) swap(l, r);

    if (sz(l) != sz(r)) {l.pb('0'); return l;}

    for (int i = 0; i < sz(l); i++)
    {
        if (l[i] == r[i]) continue;

        if (r[i] == '1') swap(l, r);

        break;
    }

    l.pb('0');

    return l;
}

int main()
{
    //freopen("input.txt", "r", stdin); freopen("output4.txt", "w", stdout);

    ios_base::sync_with_stdio(0); istream::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    int n;

    cin >> n;

    for (int i = 1; i <= n; i++)
    {
        int l, r;

        cin >> l >> r;

        if (l < 0) L[i] = abs(l); else L[i] = -l;

        if (r < 0) R[i] = abs(r); else R[i] = -r;
    }

    vector <char> gr = dfs(1);

    for (auto it : gr) cout << it;
}

Compilation message (stderr)

poklon.cpp: In function 'std::vector<char> dfs(int&)':
poklon.cpp:52:30: error: cannot bind non-const lvalue reference of type 'int&' to an rvalue of type 'int'
     if (L[v] < 0) l = dfs(abs(L[v])); else tranc(l, L[v]);
                           ~~~^~~~~~
poklon.cpp:48:15: note:   initializing argument 1 of 'std::vector<char> dfs(int&)'
 vector <char> dfs(int &v)
               ^~~
poklon.cpp:54:30: error: cannot bind non-const lvalue reference of type 'int&' to an rvalue of type 'int'
     if (R[v] < 0) r = dfs(abs(R[v])); else tranc(r, R[v]);
                           ~~~^~~~~~
poklon.cpp:48:15: note:   initializing argument 1 of 'std::vector<char> dfs(int&)'
 vector <char> dfs(int &v)
               ^~~
poklon.cpp: In function 'int main()':
poklon.cpp:95:29: error: cannot bind non-const lvalue reference of type 'int&' to an rvalue of type 'int'
     vector <char> gr = dfs(1);
                             ^
poklon.cpp:48:15: note:   initializing argument 1 of 'std::vector<char> dfs(int&)'
 vector <char> dfs(int &v)
               ^~~