Submission #107180

#	Time	Username	Problem	Language	Result	Execution time	Memory
107180		stefdasca	Bosses (BOI16_bosses)	C++14	67 / 100	1525 ms	1024 KiB

bosses

#include<bits/stdc++.h>
using namespace std;
int n, cost, ans = (1<<30);
int sz[5002];
vector<int>v[5002];
vector<int>nt[5002];
bool viz[5002];
int s;
void bfs(int nod)
{
    memset(viz, 0, sizeof(viz));
    viz[nod] = 1;
    queue<int>q;
    q.push(nod);
    while(!q.empty())
    {
        int t = q.front();
        q.pop();
        for(int j = 0; j < v[t].size(); ++j)
        {
            int vecin = v[t][j];
            if(!viz[vecin])
            {
                nt[t].push_back(vecin);
                s++;
                viz[vecin] = 1;
                q.push(vecin);
            }
        }
    }
}
void dfs(int nod)
{
    sz[nod] = 1;
    for(int i = 0; i < nt[nod].size(); ++i)
    {
        int vecin = nt[nod][i];
        dfs(vecin);
        sz[nod] += sz[vecin];
    }
    cost += sz[nod];
}
int main()
{
    cin >> n;
    for(int i = 1; i <= n; ++i)
    {
        int k;
        cin >> k;
        for(int j = 1; j <= k; ++j)
        {
            int nr;
            cin >> nr;
            v[nr].push_back(i);
        }
    }
    for(int i = 1; i <= n; ++i)
    {
        for(int j = 1; j <= n; ++j)
            nt[j].clear();
        s = 0;
        bfs(i);
        cost = 0;
        if(s == n-1)
        {
            dfs(i);
            ans = min(ans, cost);
        }
    }
    cout << ans;
    return 0;
}

Compilation message (stderr)

bosses.cpp: In function 'void bfs(int)':
bosses.cpp:19:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int j = 0; j < v[t].size(); ++j)
                        ~~^~~~~~~~~~~~~
bosses.cpp: In function 'void dfs(int)':
bosses.cpp:35:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < nt[nod].size(); ++i)
                    ~~^~~~~~~~~~~~~~~~

• Subtask 1: 22 / 22
• Subtask 2: 45 / 45
• Subtask 3: 0 / 33