Submission #422711

#	Time	Username	Problem	Language	Result	Execution time	Memory
422711		ACmachine	Space Pirate (JOI14_space_pirate)	C++17	0 / 100	255 ms	524292 KiB

space_pirate

#include <bits/stdc++.h>
using namespace std;
 
#define FOR(i, j, k, l) for(int i = (j); i < (k); i += (l))
#define FORD(i, j, k, l) for(int i = (j); i >= (k); i -= (l))
#define REP(i, n) FOR(i, 0, n, 1)
#define REPD(i, n) FORD(i, n, 0, 1)
#define pb push_back
const int INF = (int)1e9;
typedef long long ll;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n; ll k;
    cin >> n >> k;
    const int mx = 62;
    vector<vector<int>> nxt(mx, vector<int>(n, -1));
    REP(i, n){
        cin >> nxt[0][i];
        nxt[0][i]--;
    }
    FOR(i, 1, mx, 1){
        REP(j, n){
            nxt[i][j] = nxt[i - 1][nxt[i - 1][j]];
        }
    }
    vector<vector<int>> dist(n, vector<int>(n, -1));
    function<void(int, int, int)> dfs = [&](int v, int d, int s){
        dist[s][v] = d;
        if(dist[s][nxt[0][v]] == -1){
            dfs(nxt[0][v], d + 1, s);
        }
    };
    REP(i, n){
        dfs(i, 0, i);
    } 
    auto go = [&](int v, ll k){
        int m = __lg(k) + 2;
        REPD(i, m){
            if((1ll << i) <= k){
                v = nxt[i][v];
                k -= (1ll << i);
            }
        }
        return v;
    };
    vector<int> ans(n, 0);
    int def = go(0, k);
    REP(a, n){
        REP(b, n){
            if(dist[0][a] == -1){ // neviem sa dostat do zaciatku novej hrany
                ans[def]++;
            }
            else if(dist[b][a] == -1){ // nevytvorim cyklus
                ans[go(b, k - dist[0][a] - 1)]++;
            }
            else if(a == b){ // rovnake
                ans[a]++;
            } 
            else{ // vytvorim cyklus; pojdem do a
                ll kk = k - dist[0][a];
                ll cycle_size = 1 + dist[b][a];
                kk %= cycle_size;
                if(kk == 0)
                    ans[a]++;
                else
                    ans[go(b, kk - 1)]++; 
            } 
        }
    }
    REP(i, n){
        cout << ans[i] << "\n";
    }
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 37
• Subtask 3: 0 / 33
• Subtask 4: 0 / 20