Submission #697132

#	Time	Username	Problem	Language	Result	Execution time	Memory
697132		baojiaopisu	Šarenlist (COCI22_sarenlist)	C++14	110 / 110	17 ms	404 KiB

Main

#include<bits/stdc++.h>

using namespace std;

using ll = long long;
using ld = long double;
using ull = unsigned long long;

using pii = pair<int, int>;
using pll = pair<ll, ll>;
using pld = pair<ld, ld>;

#define fi first
#define se second
#define left BAO
#define right ANH
#define pb push_back
#define pf push_front
#define mp make_pair
#define ins insert
#define btpc __builtin_popcount
#define btclz __builtin_clz

#define sz(x) (int)(x.size());
#define all(x) x.begin(), x.end()
#define debug(...) " [" << #__VA_ARGS__ ": " << (__VA_ARGS__) << "] "

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int d4x[4] = {1, 0, -1, 0}; int d4y[4] = {0, 1, 0, -1};
int d8x[8] = {0, 1, 1, 1, 0, -1, -1, -1};
int d8y[8] = {1, 1, 0, -1, -1, -1, 0, 1};

template<class X, class Y>
    bool minimize(X &x, const Y &y) {
        if (x > y)
        {
            x = y;
            return true;
        }
        return false;
    }
template<class X, class Y>
    bool maximize(X &x, const Y &y) {
        if (x < y)
        {
            x = y;
            return true;
        }
        return false;
    }

const int MOD = 1e9 + 7; //998244353

template<class X, class Y>
	void add(X &x, const Y &y) {
		x = (x + y);
		if(x >= MOD) x -= MOD;
	}

template<class X, class Y> 
	void sub(X &x, const Y &y) {
		x = (x - y);
		if(x < 0) x += MOD;
	}

/* Author : Le Ngoc Bao Anh, 12A5, LQD High School for Gifted Student*/

const ll INF = 1e9;
const int N = 100 + 10;

template <typename T> T mod_inv_in_range(T a, T m) {
    // assert(0 <= a && a < m);
    T x = a, y = m;
    T vx = 1, vy = 0;
    while (x) {
        T k = y / x;
        y %= x;
        vy -= k * vx;
        std::swap(x, y);
        std::swap(vx, vy);
    }
    assert(y == 1);
    return vy < 0 ? m + vy : vy;
}
 
template <typename T> T mod_inv(T a, T m) {
    a %= m;
    a = a < 0 ? a + m : a;
    return mod_inv_in_range(a, m);
}
 
template <int MOD_> struct modnum {
    static constexpr int MOD = MOD_;
    static_assert(MOD_ > 0, "MOD must be positive");
 
    using ll = long long;
 
    int v;
 
public:
 
    modnum() : v(0) {}
    modnum(ll v_) : v(int(v_ % MOD)) { if (v < 0) v += MOD; }
    explicit operator int() const { return v; }
    friend std::ostream& operator << (std::ostream& out, const modnum& n) { return out << int(n); }
    friend std::istream& operator >> (std::istream& in, modnum& n) { ll v_; in >> v_; n = modnum(v_); return in; }
 
    friend bool operator == (const modnum& a, const modnum& b) { return a.v == b.v; }
    friend bool operator != (const modnum& a, const modnum& b) { return a.v != b.v; }
 
    modnum inv() const {
        modnum res;
        res.v = mod_inv_in_range(v, MOD);
        return res;
    }
    friend modnum inv(const modnum& m) { return m.inv(); }
    modnum neg() const {
        modnum res;
        res.v = v ? MOD-v : 0;
        return res;
    }
    friend modnum neg(const modnum& m) { return m.neg(); }
 
    modnum operator- () const {
        return neg();
    }
    modnum operator+ () const {
        return modnum(*this);
    }
 
    modnum& operator ++ () {
        v ++;
        if (v == MOD) v = 0;
        return *this;
    }
    modnum& operator -- () {
        if (v == 0) v = MOD;
        v --;
        return *this;
    }
    modnum& operator += (const modnum& o) {
        v -= MOD-o.v;
        v = (v < 0) ? v + MOD : v;
        return *this;
    }
    modnum& operator -= (const modnum& o) {
        v -= o.v;
        v = (v < 0) ? v + MOD : v;
        return *this;
    }
    modnum& operator *= (const modnum& o) {
        v = int(ll(v) * ll(o.v) % MOD);
        return *this;
    }
    modnum& operator /= (const modnum& o) {
        return *this *= o.inv();
    }
 
    friend modnum operator ++ (modnum& a, int) { modnum r = a; ++a; return r; }
    friend modnum operator -- (modnum& a, int) { modnum r = a; --a; return r; }
    friend modnum operator + (const modnum& a, const modnum& b) { return modnum(a) += b; }
    friend modnum operator - (const modnum& a, const modnum& b) { return modnum(a) -= b; }
    friend modnum operator * (const modnum& a, const modnum& b) { return modnum(a) *= b; }
    friend modnum operator / (const modnum& a, const modnum& b) { return modnum(a) /= b; }
};
using num = modnum<MOD>;

int par[N];
int find_par(int u) {
	if(par[u] < 0) return u;
	par[u] = find_par(par[u]);
	return par[u];
}
bool merge(int u, int v) {
	u = find_par(u), v = find_par(v);
	if(u == v) return false;
	if(par[u] > par[v]) swap(u, v);
	par[u] += par[v];
	par[v] = u;
	return true;
}

vector<int> g[N];
vector<pii> d[N];
int depth[N];
num pw[N];
bool used[N];
int r[N][N];

void dfs(int u) {
	for(auto v : g[u]) {
		if(v != par[u]) {
			par[v] = u;
			depth[v] = depth[u] + 1;
			dfs(v);
		}
	}
}

void BaoJiaoPisu() {
	int n, m, k; cin >> n >> m >> k;
	for(int i = 1; i < n; i++) {
		int u, v; cin >> u >> v;
		g[u].pb(v);
		g[v].pb(u);
	}	

	depth[1] = 1;
	dfs(1);

	for(int i = 1; i <= m; i++) {
		int u, v; cin >> u >> v;
		if(depth[u] > depth[v]) swap(u, v);
		while(depth[v] > depth[u]) {
			d[i].pb(mp(v, par[v]));
			v = par[v];
		}

		while(u != v) {
			d[i].pb(mp(u, par[u]));
			d[i].pb(mp(v, par[v]));
			u = par[u];
			v = par[v];
		}
	}

	for(int i = 1; i <= m; i++) {
		for(int j = 1; j <= m; j++) {
			for(auto [u, v] : d[i]) {
				for(auto [x, y] : d[j]) {
					if(u > v) swap(u, v);
					if(x > y) swap(x, y);
					if(u == x && y == v) r[i][j] = true;
				}
			}
		}
	}

	pw[0] = 1;
	for(int i = 1; i < n; i++) pw[i] = pw[i - 1] * k;
	num ans = pw[n - 1];
	for(int msk = 1; msk < (1 << m); msk++) {
		for(int i = 1; i <= n; i++) used[i] = false;
		for(int i = 1; i <= m; i++) par[i] = -1;
		for(int i = 0; i < m; i++) {
			if(msk >> i & 1) {
				for(int j = i + 1; j < m; j++) {
					if(msk >> j & 1) {
						if(r[i + 1][j + 1]) merge(i + 1, j + 1);
					}
				}

				for(auto [u, v] : d[i + 1]) {
					if(depth[u] > depth[v]) swap(u, v);
					used[v] = true;
				}
			}
		}

		int c = n - 1;
		for(int i = 1; i <= n; i++) c -= used[i];
		for(int i = 1; i <= m; i++) {
			if((msk >> (i - 1) & 1) && find_par(i) == i) ++c;
		}

		ans += (btpc(msk) & 1 ? -pw[c] : pw[c]);
	}

	cout << ans;
}

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    int tc = 1, ddd = 0;
    // cin >> tc;
    while(tc--) {
        //ddd++;
        //cout << "Case #" << ddd << ": ";
        BaoJiaoPisu();
    }
}

Compilation message (stderr)

Main.cpp: In function 'void BaoJiaoPisu()':
Main.cpp:230:13: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  230 |    for(auto [u, v] : d[i]) {
      |             ^
Main.cpp:231:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  231 |     for(auto [x, y] : d[j]) {
      |              ^
Main.cpp:254:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  254 |     for(auto [u, v] : d[i + 1]) {
      |              ^
Main.cpp: In function 'int main()':
Main.cpp:277:17: warning: unused variable 'ddd' [-Wunused-variable]
  277 |     int tc = 1, ddd = 0;
      |                 ^~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 65 / 65