Submission #548138

#	Time	Username	Problem	Language	Result	Execution time	Memory
548138		sofapuden	Islands (IOI08_islands)	C++14	30 / 100	1117 ms	131072 KiB

islands

    #include<bits/stdc++.h>
     
    using namespace std;
     
    typedef long long ll;
     
    ll mx = 0, bes = 0;
    vector<vector<array<ll,2>>> gr;
    vector<int> vis;
     
    void dfs(int x, set<int> &s, ll dis){
        vis[x] = 1;
        s.insert(x);
        if(dis > mx){
            mx = dis;
            bes = x;
        }
        for(auto y : gr[x]){
            if(!s.count(y[0]))dfs(y[0],s,dis+y[1]);
        }
        s.erase(x);
    }
     
    int main()
    {
        int n; cin >> n;
        gr.resize(n);
        vis.resize(n,0);
        for(int i = 0; i < n; ++i){
            ll a, b; cin >> a >> b;
            a--;
            gr[i].push_back({a,b});
            gr[a].push_back({i,b});
        }
        ll ans = 0;
        for(int i = 0; i < n; ++i){
            if(!vis[i]){
                mx = 0;
                set<int> s;
                dfs(i,s,0);
                dfs(bes,s,0);
                dfs(bes,s,0);
              dfs(bes,s,0);
              dfs(bes,s,0);
              dfs(bes,s,0);
                ans+=mx;
            }
        }
        cout << ans << '\n';
    }

• Subtask 1: 30 / 33
• Subtask 2: 0 / 3
• Subtask 3: 0 / 4
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10