Submission #58974

#	Time	Username	Problem	Language	Result	Execution time	Memory
58974		FLDutchman	Friend (IOI14_friend)	C++14	100 / 100	64 ms	8024 KiB

friend

#include "friend.h"
#include <bits/stdc++.h>
using namespace std;

typedef int INT;

#define mp make_pair
#define pb push_back
#define fst first
#define snd second
#define int long long
#define MMAX 16384
#define fast_io() ios::sync_with_stdio(false)
#define FOR(i, l, r) for(int i = (l); i < (r); i++)

typedef long long ll;
typedef pair<ll, ll> ii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<vi> vvi;
typedef set<int> si;
typedef double ld;
typedef pair<ld, ld> dd;

const ll INF = 1000000000000000000LL;
const int NMAX = 1100;
const int mod = 1e9+7;
const ld eps = 1e-10;
const ld PI = acos(-1);

/*
vi match;
bitset<NMAX> vis;
vi adj[NMAX];

int aug(int n){
    if(vis[n]) return 0;
    vis[n] = 1;
    for(int k : adj[n]) if(match[k] == -1 || aug(match[k])) {
        match[k] = n;
        match[n] = k;
        return 1;
    }
    return 0;
}

int MCBM(){
    int tot = 0;
    FOR(i, 0, NMAX) if(match[i] == -1) vis.reset(), tot += aug(i);
    return tot;
}


INT findSample(INT n, INT confidence[], INT host[], INT protocol[]){
    FOR(i, 1, n){
        if(protocol[i] == 0 || protocol[i] == 2){
            adj[host[i]].pb(i);
            adj[i].pb(host[i]);
            //cout << i << " " << host[i] << endl;
        }
        if(protocol[i] == 1 || protocol[i] == 2){
            for(int k : adj[host[i]]){
                //cout << i << " " << k << endl;
                adj[k].pb(i);
                adj[i].pb(k);
            }
        }
    }
    match.assign(NMAX, -1);
    //cout<<endl;
    int m = MCBM();
    FOR(i, 0, n){
        cout << i << " " << match[i] << endl;
    }
    return n - m;
}
*/

INT findSample(INT n, INT confidence[], INT host[], INT protocol[]){
    vii c;
    FOR(i, 0, n) c.pb({confidence[i], 0});
    for(int i = n-1; i > 0; i--) {
        //cout<<i<<endl;
        int h = host[i], p = protocol[i];
        int p1 = c[h].fst, q1 = c[h].snd,
            p2 = c[i].fst, q2 = c[i].snd;
        if(p == 0) c[h] = { p1 + q2, max(p2 + q1, q2 + q1) };
        if(p == 1) c[h] = { max(max(p1 + p2, p1 + q2), p2 + q1), q1 + q2 };
        if(p == 2) c[h] = { max(p1 + q2, p2 + q1), q1 + q2 };
    }
    //<<c[0].fst<<endl;
    return max(c[0].fst, c[0].snd);
}
/*
signed main(){
    fast_io();
    int N;
    INT conf[NMAX], host[NMAX], protocol[NMAX];
    cin >> N;
    FOR(i, 0, N) cin >> conf[i];
    FOR(i, 1, N) cin >> host[i], cin >> protocol[i];
    cout << findSample(N, conf, host, protocol) << endl;
    
}


6
13 3 6 20 10 15
0 0
0 1
1 2
2 1
0 0



*/

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