Submission #474701

#	Time	Username	Problem	Language	Result	Execution time	Memory
474701		hidden1	Tropical Garden (IOI11_garden)	C++14	100 / 100	194 ms	76868 KiB

garden

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

#include <bits/stdc++.h>
using namespace std;
//#pragma GCC optimize ("O3")
//#pragma GCC target ("sse4")
#define endl "\n"
typedef long long ll;
template<class T, class T2> inline ostream &operator <<(ostream &out, const pair<T, T2> &x) { out << x.first << " " << x.second; return out;}
template<class T, class T2> inline istream &operator >>(istream &in, pair<T, T2> &x) { in >> x.first >> x.second; return in;}
template<class T, class T2> inline bool chkmax(T &x, const T2 &y) { return x < y ? x = y, 1 : 0; }
template<class T, class T2> inline bool chkmin(T &x, const T2 &y) { return x > y ? x = y, 1 : 0; }
const ll mod = 1e9 + 7;
#define debug(...) cout << "Line: " << __LINE__ << endl; \
    printDebug(", "#__VA_ARGS__, __VA_ARGS__)
template <typename T>
void printDebug(const char* name, T&& arg1) { cout << (name + 2) << " = " << arg1 << endl; }
template <typename T, typename... T2>
void printDebug(const char* names, T&& arg1, T2&&... args) {
    const char* end = strchr(names + 1, ',');
    cout.write(names + 2, end - names - 2) << " = " << arg1 << endl;
    printDebug(end, args...);
}

const int MAX_N = 4e5 + 10;
vector<int> g[MAX_N];
vector<int> help[MAX_N];
int n, par[MAX_N], mn[MAX_N];
int cnt[2];
vector<int> ans[2][MAX_N];
int used[MAX_N];
int d[2][MAX_N];

void dfs(int x, int who) {
    if(x < n) {
        ans[who][d[who][x]].push_back(d[who][x]);
    }
    used[x] = true;
    for(auto it : g[x]) {
        if(used[it]) {cnt[who] = d[who][x] - d[who][it] + 1; continue;}
        d[who][it] = d[who][x] + 1;
        dfs(it, who);
    }
}

void count_routes(int N, int M, int P, int R[][2], int Q, int G[]) {
    n = N;
    fill_n(mn, n, 1e8);
    for(int i = 0; i < M; i ++) {
        int a = R[i][0], b = R[i][1];
        help[a].push_back(i);
        help[b].push_back(i);
        chkmin(mn[a], i);
        chkmin(mn[b], i);
    }
    for(int i = 0; i < n; i ++) {
        sort(help[i].begin(), help[i].end());
        if(help[i].size() == 0) {
            continue;
        } else {
            // ???
            int best = help[i][0];
            par[i] = R[best][0] + R[best][1] - i;
            if(mn[par[i]] == best) {
                par[i] += n;
            }
            best = help[i][1 % help[i].size()];
            par[i + n] = R[best][0] + R[best][1] - i;
            if(mn[par[i + n]] == best) {
                par[i + n] += n;
            }
        }
    }
    for(int i = 0; i < 2 * n; i ++) {
        g[par[i]].push_back(i);
    }

    cnt[0] = cnt[1] = -1;
    fill_n(used, 2 * n, 0);
    dfs(P, 0);

    fill_n(used, 2 * n, 0);
    dfs(P + n, 1);

    for(int i = 0; i < 2; i ++) {
        if(cnt[i] == -1) {continue;}
        for(int j = cnt[i]; j < MAX_N; j ++) {
            for(auto it : ans[i][j]) {
                ans[i][it % cnt[i]].push_back(it);
            }
        }
    }

    for(int i = 0; i < Q; i ++) {
        int ret = 0;
        if(cnt[0] != -1) {
            ret += upper_bound(ans[0][G[i] % cnt[0]].begin(), ans[0][G[i] % cnt[0]].end(), G[i]) - ans[0][G[i] % cnt[0]].begin();
        } else {
            if(G[i] < MAX_N) {
                ret += ans[0][G[i]].size();
            }
        }

        if(cnt[1] != -1) {
            ret += upper_bound(ans[1][G[i] % cnt[1]].begin(), ans[1][G[i] % cnt[1]].end(), G[i]) - ans[1][G[i] % cnt[1]].begin();
        } else {
            if(G[i] < MAX_N) {
                ret += ans[1][G[i]].size();
            }
        }

        answer(ret);
    }
}

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