Submission #35328

#	Time	Username	Problem	Language	Result	Execution time	Memory
35328		nickyrio	Bosses (BOI16_bosses)	C++14	100 / 100	719 ms	2328 KiB

bosses

#include <bits/stdc++.h>
#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 REP(i, a) for (int i = 0; i<a; i++)
#define N 5050
#define pp pair<int, int>
#define IO cin.tie(NULL);cout.tie(NULL);
#define bit(S, i) (((S) >> i) & 1)
template<typename T> inline void read(T &x) {
    char c;
    bool neg = false;
    while (!isdigit(c = getchar()) && c != '-');
    x = 0;
    if (c == '-') {
        neg = true;
        c = getchar();
    }
    do {
        x = x * 10 + c - '0';
    } while (isdigit(c = getchar()));
    if (neg) x = -x;
}
template<typename T> inline void write(T x) {
    if (x < 0) {
        putchar('-');
        write(-x);return;
    }
    if (x < 10) {
        putchar(char(x + 48));
    }
    else {
        write(x/10);
        putchar(char(48 + x%10));
    }
}
template<typename T> inline void writeln(T x) {
    write(x);
    putchar('\n');
}
using namespace std;

int n, k, u, p[N];
vector<int> e[N];
queue<int> q;
long long d[N];

long long bfs(int s) {
    FOR(i, 1, n) p[i] = 0;
    p[s] = -1;
    d[s] = 1;
    q.push(s);
    int cnt = 0;
    long long ans = 0;
    while (!q.empty()) {
        int u = q.front();
        q.pop();
        ans += d[u];
        cnt++;
        for (int v : e[u]) if (p[v] == 0) {
            p[v] = u;
            d[v] = d[u] + 1;
            q.push(v);
        }
    }
    if (cnt == n) return ans;
    return 1e18;
}
int main() {
    IO;
    read(n);
    FOR(i, 1, n) {
        read(k);
        while (k--) {
            read(u);
            e[u].push_back(i);
        }
    }
    long long ans = 1e18;
    FOR(i, 1, n) ans = min(ans, bfs(i));
    writeln(ans);
}

• Subtask 1: 22 / 22
• Subtask 2: 45 / 45
• Subtask 3: 33 / 33