Submission #295856

#	Time	Username	Problem	Language	Result	Execution time	Memory
295856		shrek12357	KOVANICE (COI15_kovanice)	C++14	50 / 100	851 ms	29436 KiB

kovanice

#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <map>
#include <set>
#include <climits>
#include <cmath>
#include <fstream>
#include <queue>
using namespace std;
#define MAXN 300005

vector<int> eq[MAXN];
vector<pair<int, int>> rest;
int n, m, k;
vector<int> adjList[MAXN];
int counts[MAXN];
bool checked[MAXN];
int compress[MAXN];
int ans[MAXN];

void fill(int src, int val) {
	compress[src] = val;
	for (auto i : eq[src]) {
		if (compress[i] == -1) {
			fill(i, val);
		}
	}
}

void dfs(int src, int depth) {
	checked[src] = true;
	for (auto i : adjList[src]) {
		if (!checked[i]) {
			dfs(i, depth + 1);
		}
	}
	if (depth == n) {
		ans[src] = 1;
		return;
	}
	for (auto i : adjList[src]) {
		if (ans[i] != -1) {
			ans[src] = ans[i] + 1;
			return;
		}
	}
}

int main() {
	cin.tie();
	ios_base::sync_with_stdio(0);
	cin >> n >> m >> k;
	
	for (int i = 0; i <= m; i++) {
		counts[i] = 0;
		compress[i] = -1;
		ans[i] = -1;
		checked[i] = false;
	}
	for (int i = 0; i < k; i++) {
		string s;
		cin >> s;
		int node1 = 0;
		int node2 = 0;
		bool found = false;
		char mark;
		for (int a = 0; a < s.size(); a++) {
			if (s[a] == '=' || s[a] == '<' || s[a] == '>') {
				found = true;
				mark = s[a];
				continue;
			}
			if (found == false) {
				node1 = node1 * 10 + (s[a] - 48);
			}
			else {
				node2 = node2 * 10 + (s[a] - 48);
			}
		}
		if (mark == '=') {
			eq[node1].push_back(node2);
			eq[node2].push_back(node1);
			continue;
		}
		if (mark == '<') {
			swap(node1, node2);
		}
		rest.push_back({ node1, node2 });
	}
	int counter = 1;
	for (int i = 1; i <= m; i++) {
		if (compress[i] == -1) {
			fill(i, counter);
			counter++;
		}
	}
	for (int i = 0; i < rest.size(); i++) {
		adjList[compress[rest[i].first]].push_back(compress[rest[i].second]);
		counts[compress[rest[i].second]]++;
	}
	for (int i = 1; i <= m; i++) {
		if (counts[i] == 0) {
			dfs(i, 1);
		}
	}
	for (int i = 1; i <= m; i++) {
		if (ans[compress[i]] != -1) {
			cout << "K";
			cout << ans[compress[i]] << endl;
		}
		else {
			cout << "?" << endl;
		}
	}
}

Compilation message (stderr)

kovanice.cpp: In function 'int main()':
kovanice.cpp:69:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   69 |   for (int a = 0; a < s.size(); a++) {
      |                   ~~^~~~~~~~~~
kovanice.cpp:99:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   99 |  for (int i = 0; i < rest.size(); i++) {
      |                  ~~^~~~~~~~~~~~~
kovanice.cpp:87:3: warning: 'mark' may be used uninitialized in this function [-Wmaybe-uninitialized]
   87 |   if (mark == '<') {
      |   ^~

• Subtask 1: 10 / 10
• Subtask 2: 40 / 40
• Subtask 3: 0 / 10
• Subtask 4: 0 / 40