Submission #583544

#	Time	Username	Problem	Language	Result	Execution time	Memory
583544		Markomafko972	KOVANICE (COI15_kovanice)	C++14	100 / 100	232 ms	30524 KiB

kovanice

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

int n, m, q;
int a[300005];
int b[300005];
char w[300005];
int prt[300005];
vector<int> v[300005];
int dub[300005];
int sol[300005];

int find(int x) {
	if (prt[x] == x) return x;
	return prt[x] = find(prt[x]);
}

void unija(int x, int y) {
	x = find(x);
	y = find(y);
	if (x == y) return;
	prt[y] = x;
}

int dfs(int x) {
	if (dub[x] > 0) return dub[x];
	
	for (int i = 0; i < v[x].size(); i++) {
		dub[x] = max(dub[x], dfs(v[x][i]));
	}
	
	dub[x]++;
	return dub[x];
}

void rek(int x) {
	sol[x] = dub[x];
	
	for (int i = 0; i < v[x].size(); i++) {
		if (sol[v[x][i]] == 0 && dub[v[x][i]]+1 == dub[x]) rek(v[x][i]);
	}
}

int main () {
	
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	
	cin >> n >> m >> q;
	for (int i = 1; i <= m; i++) prt[i] = i;
	
	for (int i = 0; i < q; i++) {
		cin >> a[i] >> w[i] >> b[i];
		if (w[i] == '=') unija(a[i], b[i]);
	}
	
	for (int i = 0; i < q; i++) {
		int poc = find(a[i]), kr = find(b[i]);
		if (w[i] == '>') v[poc].push_back(kr);
		else if (w[i] == '<') v[kr].push_back(poc);
	}
	
	for (int i = 1; i <= m; i++) {
		if (dub[find(i)] == 0) dfs(find(i));
	}
	
	for (int i = 1; i <= m; i++) {
		if (sol[find(i)] == 0 && dub[find(i)] == n) rek(find(i));
	}
	
	for (int i = 1; i <= m; i++) {
		if (sol[find(i)] == 0) cout << "?\n";
		else cout << "K" << sol[find(i)] << "\n";
	}
	
	return 0;
}

Compilation message (stderr)

kovanice.cpp: In function 'int dfs(int)':
kovanice.cpp:28:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |  for (int i = 0; i < v[x].size(); i++) {
      |                  ~~^~~~~~~~~~~~~
kovanice.cpp: In function 'void rek(int)':
kovanice.cpp:39:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |  for (int i = 0; i < v[x].size(); i++) {
      |                  ~~^~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 40 / 40
• Subtask 3: 10 / 10
• Subtask 4: 40 / 40