Submission #1110334

#	Time	Username	Problem	Language	Result	Execution time	Memory
1110334		ljtunas	Paths (BOI18_paths)	C++17	100 / 100	344 ms	194376 KiB

paths

// author : anhtun_hi , nqg
#include <bits/stdc++.h>
#define ll long long
#define ii pair<ll, ll>
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define reset(h, v)    memset(h, v, sizeof h)
#define Forv(i, a)     for(auto& i : a)
#define For(i, a, b)   for(int i = a; i <= b; ++i)
#define Ford(i, a, b)  for(int i = a; i >= b; --i)
#define c_bit(i)     __builtin_popcountll(i)
#define Bit(mask, i)    ((mask >> i) & 1LL)
#define onbit(mask, i)  ((mask) bitor (1LL << i))
#define offbit(mask, i) ((mask) &~ (1LL << i))
using namespace std;
namespace std {
    template <typename T, int D>
    struct _vector : public vector <_vector <T, D - 1>> {
        static_assert(D >= 1, "Dimension must be positive!");
        template <typename... Args>
        _vector(int n = 0, Args... args) : vector <_vector <T, D - 1>> (n, _vector <T, D - 1> (args...)) {}
    };
    template <typename T> struct _vector <T, 1> : public vector <T> {
        _vector(int n = 0, const T& val = T()) : vector <T> (n, val) {}
    };
    template <class A, class B> bool minimize(A &a, B b){return a > b ? a = b, true : false;}
    template <class A, class B> bool maximize(A &a, B b){return a < b ? a = b, true : false;}
}
const int dx[] = {0, 0, +1, -1}, dy[] = {-1, +1, 0, 0}, LOG = 20, base = 311, inf = 1e9 + 5;
const int MAXN = 5e5 + 5;
const  ll  mod = 1e9 + 7;
const  ll   oo = 1e18;

#define int long long

int n, m, k, c[MAXN]; vector<int> g[MAXN];
ll dp[MAXN][(1 << 6) + 5];

void Solve() {
    cin >> n >> m >> k;
    For(i, 1, n) cin >> c[i], --c[i];
    For(i, 1, m){
        int u, v; cin >> u >> v;
        g[u].push_back(v);
        g[v].push_back(u);
    }
    For(i, 1, n) dp[i][1 << c[i]] ++;
    ll ans = 0;
    For(s, 1, (1 << k) - 1) {
        For(i, 1, n){
            Forv(j, g[i]) {
                if(Bit(s, c[j]) == 0){
                    ans -= dp[j][onbit(s, c[j])];
                    dp[j][onbit(s, c[j])] += dp[i][s];
                    ans += dp[j][onbit(s, c[j])];
                }
            }
        }
    }
    cout << ans << '\n';
}

int32_t main() {
    cin.tie(0) -> sync_with_stdio(0);
    if(fopen("BOI18_paths.inp", "r")) {
        freopen("BOI18_paths.inp", "r", stdin);
        freopen("BOI18_paths.out", "w", stdout);
    }

    int t = 1;
//    cin >> t;

    for (int test = 1; test <= t; test++) {
        Solve();
    }
    return 0;
}

Compilation message (stderr)

paths.cpp: In function 'int32_t main()':
paths.cpp:67:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |         freopen("BOI18_paths.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
paths.cpp:68:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |         freopen("BOI18_paths.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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