oj.uz

Submission #430803

# Submission time Handle Problem Language Result Execution time Memory
430803 2021-06-17T05:26:50 Z wind_reaper Paths (BOI18_paths) C++17
0 / 100
 81 ms 7468 KB 
#include <bits/stdc++.h>
/*
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
*/

using namespace std;
// using namespace __gnu_pbds;
using namespace chrono;

// mt19937 rng((int) std::chrono::steady_clock::now().time_since_epoch().count());
/*
template <class T> using ordered_set = tree <T, null_type, less <T>, rb_tree_tag, tree_order_statistics_node_update>;
*/

//***************** CONSTANTS *****************

const int MXN = 100001;

//***************** GLOBAL VARIABLES *****************

int N, M, K;
vector<int> g[MXN];
int a[MXN];
int64_t dp[MXN][32];

//***************** AUXILIARY STRUCTS *****************



//***************** MAIN BODY *****************


void solve(){
	cin >> N >> M >> K;

	for(int i = 1; i <= N; i++)
		cin >> a[i];

	for(int i = 0; i < M; i++){
		int u, v;
		cin >> u >> v;
		g[u].push_back(v);
		g[v].push_back(u);
	}

	int64_t ans = 0;

	for(int mask = 1; mask < (1 << K); mask++){
		for(int u = 1; u <= N; u++){
			if(mask >> a[u] & 1 ^ 1)
				continue;
			if(__builtin_popcount(mask) == 1) dp[u][mask]++;
			for(int v : g[u])
				if(a[u] != a[v])
					dp[u][mask] += dp[v][mask ^ (1 << a[u])];

			ans += dp[u][mask]; 
		}
	}

	cout << ans - N << '\n';
}

//***************** *****************

int32_t main(){
	ios_base::sync_with_stdio(NULL);
	cin.tie(NULL);

	#ifdef LOCAL
		auto begin = high_resolution_clock::now();
	#endif

	int tc = 1;
	// cin >> tc; 
	for (int t = 0; t < tc; t++)
		solve();

	#ifdef LOCAL 
		auto end = high_resolution_clock::now();
		cout << fixed << setprecision(4);
		cout << "Execution Time: " << duration_cast<duration<double>>(end - begin).count() << "seconds" << endl;
	#endif

	return 0;
}

/*
If code gives a WA, check for the following : 
1. I/O format

2. Are you clearing all global variables in between tests if multitests are a thing

3. Can you definitively prove the logic
*/

Compilation message

paths.cpp: In function 'void solve()':
paths.cpp:51:20: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
   51 |    if(mask >> a[u] & 1 ^ 1)
      |       ~~~~~~~~~~~~~^~~

Subtask #1
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 2636 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 81 ms 7468 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 2636 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 30.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 2636 KB Output isn't correct
2 Halted 0 ms 0 KB -