Submission #894388

#	Time	Username	Problem	Language	Result	Execution time	Memory
894388		Trisanu_Das	Keys (IOI21_keys)	C++17	Compilation error	0 ms	0 KiB

keys

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

struct dsu {
	int n;
	vector<int> par;
	dsu(int _n): n(_n), par(_n) {
		iota(par.begin() par.end(), 0);
	}
	int leader(int x) {
		return par[x] == x ? x : par[x] = leader(par[x]);
	}
};

vector<int> find_reachable(vector<int> r, vector<int> U, vector<int> V, vector<int> C) {
	int n = r.size(), m = U.size();
	vector<vector<pair<int, int> > > adj(n);
	for (int i = 0; i < m; ++i) {
		adj[U[i]].emplace_back(V[i], C[i]);
		ajd[V[i]].emplace_back(U[i], C[i]);
	}
	dsu d(n);
	auto num = numeric_limits<size_t>::max();
	vector<int> ans, solved(n);
	while (true) {
		vector nodes(n, vector<int>());
		vector<int> vis(n), changed, appear(n), res;
		auto BFS = [&] (int S) {
			for (int x: res) appear[r[x]] = 0;
			for (int x: changed) nodes[x].clear();
			res.clear(), changed.clear();
			queue<int> Q;
			Q.push(S);
			while (!empty(Q)) {
				const auto u = Q.front();
				Q.pop();
				if (S != d.leader(u)) {
					vis[d.leader(u)] = 1;
					d.p[S] = d.leader(u);
					return;
				}
				if (vis[u]) continue;
				vis[u] = 1, res.push_back(u);
				if (!appear[r[u]]) {
					appear[r[u]] = 1;
					for (int v: nodes[r[u]]) Q.push(v);
				}
				for (auto [v, c]: e[u])
					if (appear[c]) Q.push(v);
					else nodes[c].push_back(v), changed.push_back(c);
			}
			solved[S] = 1;
			if (size(res) < num) num = size(ans = res);
			else if (size(res) == num) for (int x: res) ans.push_back(x);
		};
		bool hav = 0;
		for (int i = 0; i < n; ++i)
			if (d.leader(i) == i && !vis[i] && !solved[i]) hav = 1, BFS(i);
		if (!hav) break;
	}
	vector<int> ans_(n);
	for (int x: ans) ans_[x] = 1;
	return ans_;
}

Compilation message (stderr)

keys.cpp: In constructor 'dsu::dsu(int)':
keys.cpp:8:19: error: expected ')' before 'par'
    8 |   iota(par.begin() par.end(), 0);
      |       ~           ^~~~
      |                   )
keys.cpp:8:32: error: no matching function for call to 'iota(std::vector<int>::iterator, int)'
    8 |   iota(par.begin() par.end(), 0);
      |                                ^
In file included from /usr/include/c++/10/numeric:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:84,
                 from keys.cpp:1:
/usr/include/c++/10/bits/stl_numeric.h:88:5: note: candidate: 'template<class _ForwardIterator, class _Tp> void std::iota(_ForwardIterator, _ForwardIterator, _Tp)'
   88 |     iota(_ForwardIterator __first, _ForwardIterator __last, _Tp __value)
      |     ^~~~
/usr/include/c++/10/bits/stl_numeric.h:88:5: note:   template argument deduction/substitution failed:
keys.cpp:8:32: note:   deduced conflicting types for parameter '_ForwardIterator' ('__gnu_cxx::__normal_iterator<int*, std::vector<int> >' and 'int')
    8 |   iota(par.begin() par.end(), 0);
      |                                ^
keys.cpp: In function 'std::vector<int> find_reachable(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
keys.cpp:20:3: error: 'ajd' was not declared in this scope; did you mean 'adj'?
   20 |   ajd[V[i]].emplace_back(U[i], C[i]);
      |   ^~~
      |   adj
keys.cpp: In lambda function:
keys.cpp:39:8: error: 'struct dsu' has no member named 'p'
   39 |      d.p[S] = d.leader(u);
      |        ^
keys.cpp:48:23: error: 'e' was not declared in this scope
   48 |     for (auto [v, c]: e[u])
      |                       ^