Submission #974695

#	Time	Username	Problem	Language	Result	Execution time	Memory
974695		raul2008487	Paths (BOI18_paths)	C++17	100 / 100	329 ms	102880 KiB

paths

#include <bits/stdc++.h>

// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>

#define ll long long
#define pb push_back
#define vl vector<ll>
#define fi first
#define se second
#define in insert
#define all(v) v.begin(), v.end()
#define bpc(x) __builtin_popcount(x)
#define endl "\n"

using namespace std;
const int sz = 3e5 + 5; /// mind the sz
const ll inf = 1e18;
// using namespace __gnu_pbds;
// tree <ll, null_type, less<ll>, rb_tree_tag, tree_order_statistics_node_update> rbt;
ll n, m, k, dp[sz][33], a[sz];
vl e[sz];
ll recursiondpbetch(ll node, ll mask){
    mask |= (1 << a[node]);
    if(dp[node][mask] != -1){return dp[node][mask];}
    ll ans = 0;
    if(bpc(mask) > 1){ans++;}
    for(auto edge: e[node]){
        if(!(mask & (1 << a[edge]))){
            ans += recursiondpbetch(edge, mask);
        }
    }
    return dp[node][mask] = ans;
}
void solve(){
    ll i, j, u, v, res = 0;
    cin >> n >> m >> k;
    for(i = 1; i <= n; i++){
        cin >> a[i];
    }
    for(i = 1; i <= m; i++){
        cin >> u >> v;
        e[u].pb(v);
        e[v].pb(u);
    }
    memset(dp, -1, sizeof(dp));
    for(i = 1; i <= n; i++){
        res += recursiondpbetch(i, 0);
    }
    cout << res << endl;

}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    ll t = 1;
    // cin >> t;
    while(t--){
        solve();
    }
}
/*

*/

Compilation message (stderr)

paths.cpp: In function 'void solve()':
paths.cpp:36:11: warning: unused variable 'j' [-Wunused-variable]
   36 |     ll i, j, u, v, res = 0;
      |           ^

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