Submission #863365

#	Time	Username	Problem	Language	Result	Execution time	Memory
863365		maks007	Paths (BOI18_paths)	C++14	23 / 100	3067 ms	26960 KiB

paths

// Bismi Allah
#include "bits/stdc++.h"

using namespace std;

#define int long long

signed main () {
	ios::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	int n, m, k, ans = 0, changes = 1;
	cin >> n >> m >> k;
	vector <int> color(n), g[n], used(n), permutation;
	set <int> colorUsed;
	function <void(int, int)> dfs=[&](int v, int cur) {
		if(cur == permutation.size() - 1) {
			ans++;
			return;
		}
		used[v] = 1;
		for(auto u : g[v] ) {
			if(!used[u] && color[u] == permutation[cur+1]) dfs(u, cur + 1);
		}
		used[v]=0;
	};
	
	for(int i = 0; i < n; i ++) cin >> color[i];
	for(int i = 0; i < m; i ++) {
		int u, v;
		cin >> u >> v;
		u --, v --;
		g[u].push_back(v);
		g[v].push_back(u);
	}
	cout << "\n";
	for(int K = 2; K <= k;) {
		if(permutation.size() != K) {
			permutation.resize(K);
			for(int i = 0; i < permutation.size(); i ++) permutation[i] = i + 1;
		}else {
			sort(permutation.begin(), permutation.end());
			for(int i = 0; i < permutation.size() - 1; i ++) {
				if(permutation[i] + 1 == permutation[i + 1]) {
					permutation[i] = i + 1;
					continue;
				}
				permutation[i] ++;
				goto end;
			}
			if(permutation.back() == k) {
				 K ++;
				 continue;
			}
			permutation[permutation.size() - 1] ++;
			end:;
		}
		do{
			for(int i = 0; i < n; i ++) {
				if(color[i] == permutation[0]) dfs(i, 0);
			}
		} while(next_permutation(permutation.begin(), permutation.end()));		
	}
	cout << ans;
	return 0;
}

Compilation message (stderr)

paths.cpp: In lambda function:
paths.cpp:16:10: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |   if(cur == permutation.size() - 1) {
      |      ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
paths.cpp: In function 'int main()':
paths.cpp:37:25: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   37 |   if(permutation.size() != K) {
      |      ~~~~~~~~~~~~~~~~~~~^~~~
paths.cpp:39:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |    for(int i = 0; i < permutation.size(); i ++) permutation[i] = i + 1;
      |                   ~~^~~~~~~~~~~~~~~~~~~~
paths.cpp:42:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |    for(int i = 0; i < permutation.size() - 1; i ++) {
      |                   ~~^~~~~~~~~~~~~~~~~~~~~~~~
paths.cpp:11:24: warning: unused variable 'changes' [-Wunused-variable]
   11 |  int n, m, k, ans = 0, changes = 1;
      |                        ^~~~~~~

• Subtask 1: 23 / 23
• Subtask 2: 0 / 20
• Subtask 3: 0 / 27
• Subtask 4: 0 / 30