Submission #947154

#	Time	Username	Problem	Language	Result	Execution time	Memory
947154		NK_	Sjekira (COCI20_sjekira)	C++17	110 / 110	16 ms	4820 KiB

sjekira

// Success consists of going from failure to failure without loss of enthusiasm
#include <bits/stdc++.h>

using namespace std;

#define nl '\n'
#define pb push_back

template<class T> using V = vector<T>;
template<class T, size_t SZ> using AR = array<T, SZ>;

struct Scanner {
    FILE* stream;
    Scanner(FILE* s) : stream(s) {}
    char buf[1 << 20], * l = buf, * r = buf;
    bool flush() { l = buf; r = l + fread(buf, 1, 1 << 20, stream); return l == r; }
    void get(char& c) { c = l == r && flush() ? ' ' : *l++; }
    friend Scanner& operator >>(Scanner& in, char& c) { return in.get(c), in; }
    friend Scanner& operator >>(Scanner& in, char* s) {
        for (in.get(s[0]); isspace(s[0]); in.get(s[0]));
        for (int i = 0; !isspace(s[i]) || (s[i] = '\0'); i++) in.get(s[i + 1]);
        return in;
    }
    friend Scanner& operator >>(Scanner& in, std::string& s) {
        char c;
        for (in.get(c); isspace(c); in.get(c));
        for (s = ""; !isspace(c); in.get(c)) s += c;
        return in;
    }
    template <class T, std::enable_if_t<std::is_integral_v<T>, int> = 0>
    friend Scanner& operator >>(Scanner& in, T& x) {
        char c, f = '+';
        for (in.get(c); !isdigit(c); in.get(c))
            if constexpr (std::is_signed_v<T>) f = c;
        for (x = 0; isdigit(c); in.get(c)) x = x * (1 << 1) + x * (1 << 3) + c - '0';
        if constexpr (std::is_signed_v<T>) x = f == '-' ? -x : x;
        return in;
    }
    template <class T, std::enable_if_t<std::is_floating_point_v<T>, int> = 0>
    friend Scanner& operator >>(Scanner& in, T& x) {
        std::string s; in >> s; x = std::stod(s);
        return in;
    }
    template <class T, class U>
    friend Scanner& operator >>(Scanner& in, std::pair<T, U>& a) {
        return in >> a.first >> a.second;
    }
    template <class T, size_t S>
    friend Scanner& operator >>(Scanner& in, std::array<T, S>& a) {
        for (int i = 0, n = S; i < n; i++) in >> a[i];
        return in;
    }
    template <class T>
    friend Scanner& operator >>(Scanner& in, std::vector<T>& a) {
        for (int i = 0, n = a.size(); i < n; i++) in >> a[i];
        return in;
    }
};
 
struct Printer {
    FILE* stream;
    Printer(FILE* s) : stream(s) {}
    char buf[1 << 20], * l = buf, * r = buf + (1 << 20) - 1;
    int format = 0, precision = 15;
    ~Printer() { flush(); }
    void flush() { fwrite(buf, 1, l - buf, stream); l = buf; }
    void put(const char& c) { *l++ = c; if (l == r) flush(); }
    friend Printer& operator <<(Printer& out, const char& c) { return out.put(c), out; }
    friend Printer& operator <<(Printer& out, const char* s) {
        for (int i = 0; s[i] != '\0'; i++) out.put(s[i]);
        return out;
    }
    friend Printer& operator <<(Printer& out, const std::string& s) {
        for (int i = 0, n = s.size(); i < n; i++) out.put(s[i]);
        return out;
    }
    template <class T, std::enable_if_t<std::is_integral_v<T>, int> = 0>
    friend Printer& operator <<(Printer& out, T x) {
        static char s[40];
        static int i = 0;
        if (x == 0) { out.put('0'); return out; }
        if constexpr (std::is_signed_v<T>) x = x < 0 ? out.put('-'), -x : x;
        while (x > 0) s[++i] = x % 10 + '0', x /= 10;
        while (i > 0) out.put(s[i--]);
        return out;
    }
    template <class T, std::enable_if_t<std::is_floating_point_v<T>, int> = 0>
    friend Printer& operator <<(Printer& out, T x) {
        std::ostringstream oss;
        oss << std::fixed << std::setprecision(out.precision) << x;
        return out << oss.str();
    }
    template <class T, class U>
    friend Printer& operator <<(Printer& out, const std::pair<T, U>& a) {
        return out << a.first << " \n"[out.format > 1] << a.second;
    }
    template <class T, size_t S>
    friend Printer& operator <<(Printer& out, const std::array<T, S>& a) {
        out << a[0];
        for (int i = 1, n = S; i < n; i++) out << " \n"[out.format > 1] << a[i];
        return out;
    }
    template <class T>
    friend Printer& operator <<(Printer& out, const std::vector<T>& a) {
        if (!a.empty()) out << a[0];
        for (int i = 1, n = a.size(); i < n; i++) out << " \n"[out.format > 0] << a[i];
        return out;
    }
};

Scanner in(stdin);
Printer out(stdout);

using ll = long long;

const int nax = 1e5+5;
int e[nax], mx[nax];

int get(int x) { return e[x] < 0 ? x : e[x] = get(e[x]); }
void unite(int x, int y) {
	x = get(x), y = get(y);

	if (e[x] > e[y]) swap(x, y);
	e[x] += e[y]; e[y] = x; mx[x] = max(mx[x], mx[y]);
}

int main() {
	cin.tie(0)->sync_with_stdio(0);
	
	int N; in >> N;

	for(int i = 0; i < N; i++) {
		in >> mx[i];
		e[i] = -1;
	}

	V<AR<int, 3>> E; for(int i = 0; i < N - 1; i++) {
		int u, v; in >> u >> v; --u, --v;
		E.pb({max(mx[u], mx[v]), u, v});
	}

	sort(begin(E), end(E));

	ll ans = 0;
	for(auto& [w, u, v] : E) {
		ans += mx[get(u)] + mx[get(v)];
		unite(u, v);
	}

	out << ans << nl;

	exit(0-0);
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 30 / 30
• Subtask 4: 60 / 60