Submission #299124

#	Time	Username	Problem	Language	Result	Execution time	Memory
299124		ToMmyDong	Tropical Garden (IOI11_garden)	C++17	49 / 100	59 ms	15600 KiB

garden

#include <bits/extc++.h>
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef pair<int,int> pii;
#define ALL(i) i.begin(),i.end()
#define SZ(i) int(i.size())
#define X first
#define Y second
#define eb emplace_back
#define pb push_back
#ifdef tmd
#define debug(...) fprintf(stderr,"#%d-(%s)=",__LINE__,#__VA_ARGS__);_do(__VA_ARGS__);
template<typename T> void _do(T &&x) {cerr<<x<<endl;}
template<typename T, typename ...S> void _do(T &&x, S &&...y) {cerr<<x<<",";_do(y...);}
template<typename IT> ostream& printRng (ostream& os, IT bg, IT ed) {
    os << "{";
    for (IT it=bg; it!=ed; it++) {
        if (it == bg) os << *it;
        else os << "," << *it;
    }
    return os << "}";
}
template<typename T> ostream& operator << (ostream& os, const vector<T>& v) {return printRng(os,ALL(v));}
#else
#define debug(...)
#endif
#include "garden.h"
#include "gardenlib.h"

const int INF = 0x3f3f3f3f;
int n, m, p;
struct Edge {
    int to, w, id;
    bool operator < (const Edge &e) const {
        return w < e.w;
    }
};
vector<int> ed;
vector<vector<Edge>> edge;
vector<int> to, csz, dis, dfn;

int tme = 0;
int init;
void make_csz (int nd) {
    dfn[nd] = tme++;
    csz[nd] = INF;
    if (csz[to[nd]] == -1) make_csz(to[nd]);
    else if (csz[to[nd]] == INF) {
        if (dfn[to[nd]] >= init) {
            csz[to[nd]] = tme - dfn[to[nd]];
        }
    }
    csz[nd] = csz[to[nd]];
}

void make_dis (int nd) {
    dis[nd] = INF;
    if (dis[to[nd]] == -1) make_dis(to[nd]);
    dis[nd] = dis[to[nd]] + 1;
}

void count_routes(int N, int M, int P, int R[][2], int Q, int G[]) {
    edge.resize(N);
    n = N;
    m = N;
    p = P;
    int cnt = 0;
    for (int i=0; i<M; i++) {
        int u = R[i][0], v = R[i][1];
        edge[u].pb({v, i, cnt++});
        edge[v].pb({u, i, cnt++});
    }
    ed.resize(cnt);
    for (int i=0; i<n; i++) {
        for (auto e : edge[i]) {
            ed[e.id] = e.to;
        }
    }
    to.resize(cnt), csz.resize(cnt, -1), dis.resize(cnt, -1);
    dfn.resize(cnt, 0);
    for (int i=0; i<n; i++) {
        sort(ALL(edge[i]));
    }

    vector<int> start;
    for (int i=0; i<n; i++) {
        for (const Edge &e : edge[i]) {
            int x = e.to;
            if (x == p) dis[e.id] = 0;
            if (SZ(edge[x]) == 1) {
                to[e.id] = edge[x][0].id;
            } else {
                to[e.id] = edge[x][edge[x][0].w == e.w ? 1 : 0].id;
            }
        }
        start.eb(edge[i][0].id);
    }
    debug(to);
    debug(start);
    debug(ed);

    for (int i=0; i<cnt; i++) {
        if (csz[i] == -1) {
            init = tme;
            make_csz(i);
        }
    }
    for (int i=0; i<cnt; i++) {
        if (dis[i] == -1) {
            make_dis(i);
        }
    }

    for (int _=0; _<Q; _++) {

        int ans = 0;
        for (int x : start) {
            if (dis[x] < G[_]) {
                ans += (G[_] - 1 - dis[x]) % csz[x] == 0;
            }
        }

        /*
        for (int x : start) {
            for (int i=0; i<G[_]-1; i++) {
                x = to[x];
            }
            debug(ed[x], p);
            if (ed[x] == p) ans++;
        }
        */

        /*
        for (int i=0; i<N; i++) {
            int x = i;
            int prv = -1;
            for (int j=0; j<G[_]; j++) {
                debug(x);
                if (edge[x][0].w != prv || SZ(edge[x]) == 1) {
                    prv = edge[x][0].w;
                    x = edge[x][0].to;
                } else {
                    prv = edge[x][1].w;
                    x = edge[x][1].to;
                }
            }
            debug(i, x);
            ans += x == p;
        }
        */
        answer(ans);
    }
}

• Subtask 1: 49 / 49
• Subtask 2: 0 / 20
• Subtask 3: 0 / 31