Submission #436721

#	Time	Username	Problem	Language	Result	Execution time	Memory
436721		ScarletS	Friend (IOI14_friend)	C++17	23 / 100	3 ms	336 KiB

friend

#include <bits/stdc++.h>
#define ll long long
#define sz(x) (int)(x).size()
using namespace std;
 
const int N = 1005;
int mt[N];
vector<int> e[N], v[2];
bitset<N> done, cmp;
 
void dfs(int c, int x)
{
    v[x].push_back(c);
    mt[c]=-1;
    cmp[c]=1;
    for (int i : e[c])
        if (!cmp[i])
            dfs(i,x^1);
}
 
bool try_kuhn(int c)
{
    if (done[c])
        return 0;
    done[c]=1;
    for (int i : e[c])
        if (mt[i]==-1||try_kuhn(mt[i]))
        {
            mt[i]=c;
            return 1;
        }
    return 0;
}
 
int findSample(int n, int confidence[], int host[], int protocol[])
{
    for (int i=1;i<n;++i)
    {
        if (protocol[i]==0)
        {
            e[i].push_back(host[i]);
            e[host[i]].push_back(i);
        }
        else
        {
            for (int j : e[host[i]])
            {
                e[i].push_back(j);
                e[j].push_back(i);
            }
        }
    }
    int tot=0, cur;
    for (int i=0;i<n;++i)
        if (!cmp[i])
        {
            v[0].clear();
            v[1].clear();
            dfs(i,0);
            for (int j : v[0])
            {
                done.reset();
                try_kuhn(j);
            }
            cur=0;
            for (int j : v[1])
                if (mt[j]!=-1)
                    ++cur;
            tot+=sz(v[0])+sz(v[1])-cur;
        }
    return tot;
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 8
• Subtask 3: 0 / 8
• Subtask 4: 0 / 19
• Subtask 5: 23 / 23
• Subtask 6: 0 / 31