제출 #1076417

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1076417		ArthuroWich	열대 식물원 (Tropical Garden) (IOI11_garden)	C++17	100 / 100	1363 ms	76276 KiB

garden

#include "garden.h"
#include "gardenlib.h"
#include<bits/stdc++.h>
using namespace std;
int n, m, p, ans = 0;
vector<int> adj[150005], radj[300005];
int succ[300005][31], vis1[300005], vis2[300005], dep1[300005], dep2[300005], cyc1 = -1, cyc2 = -1;
void initsucc() {
    for (int j = 1; j < 31; j++) {
        for (int i = 0; i <= 2*n; i++) {
            succ[i][j] = succ[succ[i][j-1]][j-1];
        }
    }
}
void calc(int a, int k) {
    for (int i = 0; i < 31; i++) {
        if (k & (1 << i)) {
            a = succ[a][i];
        }
    }
    if (a == p || a == p+n) {
        ans++;
    }
}
void dfs1(int i, int st, int d) {
    if (vis1[i] && st == i && cyc1 == -1) {
        cyc1 = d;
        return;
    }
    if (vis1[i]) {
        return;
    }
    vis1[i] = 1;
    dep1[i] = d;
    for (int j : radj[i]) {
        dfs1(j, st, d+1);
    }
}
void dfs2(int i, int st, int d) {
    if (vis2[i] && st == i && cyc2 == -1) {
        cyc2 = d;
        return;
    }
    if (vis2[i]) {
        return;
    }
    vis2[i] = 1;
    dep2[i] = d;
    for (int j : radj[i]) {
        dfs2(j, st, d+1);
    }
}
void count_routes(int N, int M, int P, int R[][2], int Q, int G[]) {
    n = N, m = M, p = P;
    for (int i = 0; i < m; i++) {
        if (adj[R[i][0]].size() < 2) {
            adj[R[i][0]].push_back(R[i][1]);
        }
        if (adj[R[i][1]].size() < 2) {
            adj[R[i][1]].push_back(R[i][0]);
        }
    }
    for (int i = 0; i < n; i++) {
        if (adj[i].size() == 1) {
            if (i == adj[adj[i][0]][0]) {
                succ[i][0] = adj[i][0]+n;
            } else {
                succ[i][0] = adj[i][0];
            }
            succ[i+n][0] = succ[i][0];
        } else {
            if (i == adj[adj[i][0]][0]) {
                succ[i][0] = adj[i][0]+n;
            } else {
                succ[i][0] = adj[i][0];
            }
            if (i == adj[adj[i][1]][0]) {
                succ[i+n][0] = adj[i][1]+n;
            } else {
                succ[i+n][0] = adj[i][1];
            }
        }
    }
    initsucc();
    if (Q == 1) {
        ans = 0;
        for (int i = 0; i < n; i++) {
            calc(i, G[0]);
        }
        answer(ans);
        return;
    } 
    for (int i = 0; i < 2*n; i++) {
        radj[succ[i][0]].push_back(i);
    }
    dfs1(p, p, 0);
    dfs2(p+n, p+n, 0);
    for (int j = 0; j < Q; j++) {
        ans = 0;
        for (int i = 0; i < n; i++) {
            bool f1 = 0, f2 = 0;
            int k = G[j];
            if (vis1[i]) {
                k -= dep1[i];
                if (k == 0) {
                    f1 = 1;
                } else if (cyc1 != -1 && k % cyc1 == 0) {
                    f1 = 1;
                }
            }
            k = G[j];
            if (vis2[i]) {
                k -= dep2[i];
                if (k == 0) {
                    f2 = 1;
                } else if (cyc2 != -1 && k % cyc2 == 0) {
                    f2 = 1;
                }
            }
            if (f1 || f2) {
                ans++;
            }
        }
        answer(ans);
    }
}

• Subtask 1: 49 / 49
• Subtask 2: 20 / 20
• Subtask 3: 31 / 31