Submission #1274555

#	Time	Username	Problem	Language	Result	Execution time	Memory
1274555		DanielPr8	Paths (BOI18_paths)	C++20	100 / 100	422 ms	107796 KiB

paths

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vll = vector<ll>;
using pll = pair<ll,ll>;
using vpl = vector<pll>;
using vvl =vector<vll>;
#define f first
#define s second
#define pb push_back
#define all(v) v.begin(),v.end()

int main(){
    ios_base::sync_with_stdio(0);cin.tie(NULL);
    ll n, m ,k;
    cin >> n >> m >> k;
    vll cl(n);
    for(ll& i:cl){cin >> i;i--;}
    vvl g(n);
    for(ll a, b, i=0; i < m; ++i){
        cin >> a >> b;
        g[--a].pb(--b);
        g[b].pb(a);
    }
    vvl dp(n, vll(32));
    vll ord(31);
    iota(all(ord),1);
    sort(all(ord), [&](ll a, ll b){return __builtin_popcount(a)<__builtin_popcount(b);});
    for(ll i = 0; i < n; ++i)dp[i][1<<cl[i]]=1;
    ll ans = 0;
    for(ll i: ord){
        for(ll j = 0; j < n; ++j){
            if(__builtin_popcount(i)>1)ans += dp[j][i];
            if(i & (1<<cl[j])){
                for(ll h: g[j]){
                    if(i & (1<<cl[h]))continue;
                    dp[h][i|(1<<cl[h])]+=dp[j][i];
                }
            }
        }
    }
    cout << ans;
}

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