Submission #1107659

#	Time	Username	Problem	Language	Result	Execution time	Memory
1107659		laight	Tropical Garden (IOI11_garden)	C++17	100 / 100	2059 ms	33396 KiB

garden

#include "garden.h"
#include "gardenlib.h"

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#define pi pair<int, int>
#define fi first
#define se second
#define ll long long
#define ull unsigned long long
#define ld long double
#define pb push_back
#define mp make_pair
#define pll pair<ll, ll>
#define umi unordered_map<int, int>
#define umll unordered_map<ll, ll>
#define umllv unordered_map<ll, vector<ll>>

#define getchar() (*_pinp?*_pinp++:(_inp[fread(_pinp=_inp, 1, 4096, stdin)]='\0', *_pinp++))
char _inp[4097], *_pinp=_inp;
#define scan(x) do{while((x=getchar())<'-'); _ssign=x=='-'; if(_ssign) while((x=getchar())<'0'); for(x-='0'; '0'<=(_=getchar()); x=(x<<3)+(x<<1)+_-'0'); x=_ssign?-x:x;}while(0)
char _; bool _ssign;

// #pragma GCC optimize("Ofast")
// #pragma GCC target("avx2")

using namespace std; using namespace __gnu_pbds;

const int MM = 1e5+5e4+5;
const ll inf = 2e15+1;
const int lg = 17; // 17 for 1e5, 31 for 1e9

int n, m, p, a, b, dis[2*MM], lv, cycl, q, inp; bool cyc[2*MM], vis[2*MM];
vector<int> adj[2*MM], g(2005), ans(2005), to(2*MM); vector<pi> graph[MM];

void g_f(int par, int c, int d){
    dis[c] = d;
    for (int i : adj[c]){
        if (i == par || cyc[i]) continue;
        g_f(c, i, d+1);
    }
}
void cyc_f(int c){
    vis[c] = 1;
    if (vis[to[c]]){
        int st = to[c];
        while (st != c){
            cyc[st] = 1; st = to[st];
            ++lv;
        }
        cyc[c] = 1;
        ++lv;
        return;
    }
    cyc_f(to[c]);
}
void sol(int sp){
    memset(dis, -1, sizeof(dis));
    memset(vis, 0, sizeof(vis));
    memset(cyc, 0, sizeof(cyc));
    lv=0;
    bool incyc=0;
    cyc_f(sp);
    cycl = lv;
    if (cyc[sp]){
        incyc=1;
        g_f(-1, sp, 0);
        int nxt=to[sp];
        while (nxt != sp){
            g_f(-1, nxt, --lv);
            nxt = to[nxt];
        }
    }
    else{
        cyc[to[sp]] = 1;
        g_f(-1, sp, 0);
    }
    for (int i=0; i<q; ++i){
        for (int j=0; j<n; ++j){
            if (dis[j] == -1) continue;
            if (incyc){
                if (g[i] >= dis[j] && (g[i]%cycl == dis[j]%cycl)){
                    ++ans[i];
                }
            }
            else{
                if (g[i] == dis[j]) ++ans[i];
            }
        }
    }
}
void count_routes(int N, int M, int P, int R[][2], int Q, int G[]){
    // cin.tie(0); cin.sync_with_stdio(0);
    n = N; m = M; p = P;
    for (int i=0; i<m; ++i){
        graph[R[i][0]].pb({i+1, R[i][1]}); graph[R[i][1]].pb({i+1, R[i][0]});
    }
    q = Q; for (int i=0; i<q; i++) {g[i] = G[i];}
    for (int i=0; i<n; ++i){
        if (graph[i][0].fi == graph[graph[i][0].se][0].fi){
            to[i] = n+graph[i][0].se;
        }
        else to[i] = graph[i][0].se;
        if (graph[i].size() >= 2){
            if (graph[i][1].fi == graph[graph[i][1].se][0].fi){
                to[n+i] = n+graph[i][1].se;
            }
            else to[n+i] = graph[i][1].se;
        }
        else{
            if (graph[i][0].fi == graph[graph[i][0].se][0].fi){
                to[n+i] = n+graph[i][0].se;
            }
            else to[n+i] = graph[i][0].se;
        }
    }
    for (int i=0; i<2*n; ++i){
        adj[i].pb(to[i]); adj[to[i]].pb(i);
    }
    sol(p); sol(n+p);
    for (int i=0; i<q; ++i){
        answer(ans[i]);
    }
}

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