Submission #313552

#	Time	Username	Problem	Language	Result	Execution time	Memory
313552		talant117408	Friend (IOI14_friend)	C++17	46 / 100	261 ms	65540 KiB

friend

#include "friend.h"
#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef pair <ll, ll> pii;
 
#define precision(n) fixed << setprecision(n)
#define pb push_back
#define ub upper_bound
#define lb lower_bound
#define mp make_pair
#define eps (double)1e-9
#define PI 2*acos(0.0)
#define endl "\n"
#define sz(v) (int)(v).size()
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define do_not_disturb ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);

const int N = 1e5+7;
vector <vector <int>> graph(N), flgraph;
vector <int> red, blue, par;
int dp[1007][2], adj[13][13], vis[1007], res[1007][1007], mf, f;

void augment(int v, int mnedge){
    if(v == 1001){
        f = mnedge;
        return;
    }
    else if(par[v] != -1){
        augment(par[v], min(mnedge, res[par[v]][v]));
        res[par[v]][v] -= f;
        res[v][par[v]] += f;
    }
}

void findmf(){
    mf = 0;
    while(1){
        f = 0;
        bitset <1007> vismf;
        vismf[1001] = 1;
        queue <int> K; K.push(1001);
        par.assign(1007, -1);
        
        while(sz(K)){
            int u = K.front(); K.pop();
            if(u == 1002) break;
            for(auto &to : flgraph[u]){
                if(res[u][to] > 0 && !vismf[to]){
                    vismf[to] = 1;
                    K.push(to);
                    par[to] = u;
                }
            }
        }
        augment(1002, 2000000007);
        if(!f) break;
        mf += f;
    }
}

void dfs1(int v, int alt = 1){
    if(alt) blue.pb(v);
    else red.pb(v);
    vis[v] = 1;
    
    for(auto to : graph[v]){
        if(!vis[to]){
            dfs1(to, alt^1);
        }
    }
}

void dfs(int v, int p = -1){
    for(auto to : graph[v]){
        if(to != p){
            dfs(to, v);
            dp[v][1] += dp[to][0];
            dp[v][0] += max(dp[to][1], dp[to][0]);
        }
    }
}

int findSample(int n, int conf[], int host[], int prot[]){
    int cnt = 0, cnt1 = 0, cnt2 = 0, flagc = 0, flagp = 0;
    for(int i = 1; i < n; i++){
        if(!prot[i]){
            cnt++;
            graph[host[i]].pb(i);
            graph[i].pb(host[i]);
        }
        else if(prot[i]&1){
            cnt1++;
            for(auto to : graph[host[i]]){
                graph[to].pb(i);
                graph[i].pb(to);
            }
        }
        else{
            cnt2++;
            flagp++;
            for(auto to : graph[host[i]]){
                graph[to].pb(i);
                graph[i].pb(to);
            }
            graph[host[i]].pb(i);
            graph[i].pb(host[i]);
        }
        if(conf[i] != 1) flagc++;
    }
    
    if(n < 11){
        for(int i = 0; i < n; i++){
            for(auto to : graph[i]){
                adj[i][to] = adj[to][i] = 1;
            }
        }
        
        int mx = 0;
        for(int mask = 0; mask < (1<<n); mask++){
            int sum = 0;
            for(int i = 0; i < n; i++){
                if(mask & (1 << i)){
                    sum += conf[i];
                    for(int j = 0; j < n; j++){
                        if((mask & (1 << j)) && adj[j][i]) sum = -2e9;
                    }
                }
            }
            mx = max(mx, sum);
        }
        return mx;
    }
    
    else if(cnt1 == n-1){
        int sum = 0;
        for(int i = 0; i < n; i++){
            sum += conf[i];
        }
        return sum;
    }
    
    else if(cnt2 == n-1){
        int mx = 0;
        for(int i = 0; i < n; i++){
            mx = max(mx, conf[i]);
        }
        return mx;
    }
    
    else if(cnt == n-1){
        for(int i = 0; i < n; i++){
            dp[i][1] = conf[i];
        }
        dfs(0);
        return max(dp[0][0], dp[0][1]);
    }
    else if(!flagc && !flagp){
        int sum = 0;
        for(int i = 0; i < n; i++){
            if(!vis[i]){
                dfs1(i);
                flgraph = vector <vector <int>> (1007);
                for(auto to : red){
                    flgraph[1001].pb(to);
                    res[1001][to] = 1;
                    for(auto it : graph[to]){
                        res[to][it] = 1;
                        flgraph[to].pb(it);
                    }
                }
                for(auto to : blue){
                    flgraph[to].pb(1002);
                    res[to][1002] = 1;
                }
                findmf();
                sum += sz(red)+sz(blue)-mf;
            }
        }
        return sum;
    }
    
    return 1;
}

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