제출 #1008301

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1008301		c2zi6	열대 식물원 (Tropical Garden) (IOI11_garden)	C++14	100 / 100	1868 ms	33876 KiB

garden

#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
#define ff first
#define ss second
#define pb push_back
#define all(a) (a).begin(), (a).end()
#define replr(i, a, b) for (int i = int(a); i <= int(b); ++i)
#define reprl(i, a, b) for (int i = int(a); i >= int(b); --i)
#define rep(i, n) for (int i = 0; i < int(n); ++i)
#define mkp(a, b) make_pair(a, b)
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> PII;
typedef vector<int> VI;
typedef vector<PII> VPI;
typedef vector<VI> VVI;
typedef vector<VVI> VVVI;
typedef vector<VPI> VVPI;
typedef pair<ll, ll> PLL;
typedef vector<ll> VL;
typedef vector<PLL> VPL;
typedef vector<VL> VVL;
typedef vector<VVL> VVVL;
typedef vector<VPL> VVPL;
template<class T> T setmax(T& a, T b) {if (a < b) return a = b; return a;}
template<class T> T setmin(T& a, T b) {if (a < b) return a; return a = b;}
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template<class T>
using indset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#include "garden.h"
#include "gardenlib.h"

void BFS(VVI& gp, int s, VI& dist) {
    int n = gp.size();
    queue<int> q;
    dist = VI(n, -1);
    dist[s] = 0;
    q.push(s);
    while (q.size()) {
        int u = q.front();
        q.pop();
        for (int v : gp[u]) if (v != s) {
            dist[v] = dist[u]+1;
            q.push(v);
        }
    }
}

int floyd(int s, VI& gp, VI& cycle) {
    if (gp[s] == -1) return 0;
    int cnt = 0;
    int u = s;
    int v = s;
    do {
        u = gp[u];
        v = gp[gp[v]];
    } while (u != v);
    do {
        u = gp[u];
        cycle[u] = true;
        cnt++;
    } while (u != v);
    return cnt;
}

void count_routes(int N, int M, int P, int R[][2], int Q, int G[]) {
    int n = N;
    int m = M;
    VVI initgp(n);
    rep(i, m) {
        int u = R[i][0];
        int v = R[i][1];
        initgp[u].pb(v);
        initgp[v].pb(u);
    }
    VI gp(2*n, -1);
    rep(u, n) {int v;
        v = initgp[u][0];
        if (initgp[v].size() == 1 || initgp[v][0] != u) {
            gp[u] = v;
        } else {
            gp[u] = v+n;
        }
        if (initgp[u].size() == 1) continue;
        v = initgp[u][1];
        if (initgp[v].size() == 1 || initgp[v][0] != u) {
            gp[u+n] = v;
        } else {
            gp[u+n] = v+n;
        }
    }

    /*cout << "Expected: ";*/
    /*auto erexa = [&](int u, int k) {*/
    /*    while (k--) u = gp[u];*/
    /*    return u;*/
    /*};*/
    /*rep(i, Q) {*/
    /*    int ans = 0;*/
    /*    rep(u, n) {*/
    /*        int x = erexa(u, G[i]);*/
    /*        if (x == P || x == P+n) ans++;*/
    /*    }*/
    /*    cout << ans << " ";*/
    /*}*/
    /*cout << endl;*/

    auto val = [&](int u) {
        if (u < n) return to_string(u);
        return to_string(u-n) + "*";
    };

    VI cycle(2*n);
    int lng1 = floyd(P, gp, cycle);
    int lng2 = floyd(P+n, gp, cycle);
    VVI trans(2*n);
    rep(u, 2*n) if (gp[u] != -1) trans[gp[u]].pb(u);
    VI dist1, dist2;
    BFS(trans, P, dist1);
    BFS(trans, P+n, dist2);
    rep(i, Q) { int k = G[i];
        int ans = 0;
        if (cycle[P]) {
            rep(u, n) if (dist1[u] != -1) {
                ans += (dist1[u]%lng1 == k%lng1 && k >= dist1[u]);
            }
        } else {
            rep(u, n) {
                ans += (dist1[u] == k);
            }
        }

        if (gp[P+n] != -1) {
            if (cycle[P+n]) {
                rep(u, n) if (dist2[u] != -1) {
                    ans += (dist2[u]%lng2 == k%lng2 && k >= dist2[u]);
                }
            } else {
                rep(u, n) {
                    ans += (dist2[u] == k);
                }
            }
        }
        answer(ans);
    }
}

컴파일 시 표준 에러 (stderr) 메시지

garden.cpp: In function 'void count_routes(int, int, int, int (*)[2], int, int*)':
garden.cpp:110:10: warning: variable 'val' set but not used [-Wunused-but-set-variable]
  110 |     auto val = [&](int u) {
      |          ^~~

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