Submission #575313

#	Time	Username	Problem	Language	Result	Execution time	Memory
575313		KoD	Toy Train (IOI17_train)	C++17	Compilation error	0 ms	0 KiB

train

#include "train.h"
#include <bits/stdc++.h>

using ll = long long;

using std::vector;
using std::array;
using std::pair;
using std::tuple;

template <class F> struct fixed : private F {
    fixed(F&& f) : F(std::forward<F>(f)) {}
    template <class... Args> decltype(auto) operator()(Args&&... args) const {
        return F::operator()(*this, std::forward<Args>(args)...);
    }
};

vector<int> who_wins(vector<int> a, vector<int> r, vector<int> u, vector<int> v) {
    const int n = a.size();
    const int m = u.size();
    vector<char> loop(n);
    vector<vector<int>> graph(n), rgraph(n);
    for (int i = 0; i < m; ++i) {
        if (u[i] == v[i]) {
            loop[u[i]] = true;
        }
        graph[u[i]].push_back(v[i]);
        rgraph[v[i]].push_back(u[i]);
    }
    vector<char> vis(n);
    vector<int> stack;
    for (int u = 0; u < n; ++u) {
        fixed([&](auto&& dfs, const int u) -> void {
            if (r[u] or vis[u]) return;
            vis[u] = true;
            for (const int v : graph[u]) {
                dfs(v);
            }
            stack.push_back(u);
        })(u);
    }
    std::fill(vis.begin(), vis.end(), false);
    vector<vector<int>> group;
    while (!stack.empty()) {
        const int u = stack.back();
        stack.pop_back();
        if (vis[u]) continue;
        auto& list = group.emplace_back();
        fixed([&](auto&& dfs, const int u) -> void {
            if (r[u] or vis[u]) return;
            vis[u] = true;
            for (const int v : rgraph[u]) {
                dfs(v);
            }
            list.push_back(u);
        })(u);
    }
    vector<int> ret(n, 1);
    for (const auto& list : group) {
        if (list.size() == 1) {
            const int u = list[0];
            if (loop[u]) {
                ret[u] = 0;
            }
        } else {
            for (const int u : list) {
                ret[u] = true;
            }
        }
    }
    std::fill(vis.begin(), vis.end(), false);
    vector<int> stack;
    for (int u = 0; u < n; ++u) {
        fixed([&](auto&& dfs, const int u) -> void {
            if (vis[u]) return;
            vis[u] = true;
            for (const int v : graph[u]) {
                dfs(v);
            }
            stack.push_back(u);
        })(u);
    }
    std::fill(vis.begin(), vis.end(), false);
    group.clear();
    while (!stack.empty()) {
        const int u = stack.back();
        stack.pop_back();
        if (vis[u]) continue;
        auto& list = group.emplace_back();
        fixed([&](auto&& dfs, const int u) -> void {
            if (vis[u]) return;
            vis[u] = true;
            for (const int v : rgraph[u]) {
                dfs(v);
            }
            list.push_back(u);
        })(u);
    }
    while (!group.empty()) {
        auto list = std::move(group.back());
        group.pop_back();
        bool found = false;
        for (const int u : list) {
            for (const int v : graph[u]) {
                if (ret[v] == 0) {
                    ret[u] = 0;
                }
            }
            if (ret[u] == 0) {
                found = true;
            }
        }
        if (found) {
            for (const int u : list) {
                ret[u] = 0;
            }
        }
    }
    return ret;
}

Compilation message (stderr)

train.cpp: In function 'std::vector<int> who_wins(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
train.cpp:72:17: error: redeclaration of 'std::vector<int> stack'
   72 |     vector<int> stack;
      |                 ^~~~~
train.cpp:31:17: note: 'std::vector<int> stack' previously declared here
   31 |     vector<int> stack;
      |                 ^~~~~