Submission #1178126


Source Code Expand

#include <bits/stdc++.h>
 
#ifndef LOCAL_
#define fprintf if( false ) fprintf
#endif // LOCAL_
#define dumpl(x1) fprintf(stderr, "#%s.%d (%s) = (%ld)\n", __func__, __LINE__, #x1, x1);
#define dumpll(x1, x2) fprintf(stderr, "#%s.%d (%s, %s) = (%ld, %ld)\n", __func__, __LINE__, #x1, #x2, x1, x2);
#define dumpd(x1) fprintf(stderr, "#%s.%d (%s) = (%lf)\n", __func__, __LINE__, #x1, x1);
#define dumpdd(x1, x2) fprintf(stderr, "#%s.%d (%s, %s) = (%lf, %lf)\n", __func__, __LINE__, #x1, #x2, x1, x2);
#define loop for(;;)
 
struct S002 {
  int n;
  S002& operator > (long& x) {
    n = x;
    return *this;
  }
  S002& operator > (long&& x) {
    n = x;
    return *this;
  }
  S002& operator >= (long& x) {
    if( scanf("%ld", &x) <= 0 ) exit(0);
    return *this;
  }
  S002& operator >= (double& x) {
    if( scanf("%lf", &x) <= 0 ) exit(0);
    return *this;
  }
  S002& operator >= (std::string& s) {
    if( not (std::cin >> s) ) exit(0);
    return *this;
  }
  template<typename a>
  S002& operator >= (std::vector<a>& v) {
    v.resize(n);
    for(long i = 0; i < n; ++i) {
      *this >= v[i];
    }
    return *this;
  }
  template<typename a, std::size_t s>
  S002& operator >= (std::array<a, s>& x) {
    for(long i = 0; i < (long)s; ++i) {
      *this >= x[i];
    }
    return *this;
  }
};

struct S004 {
  S004() : s(-1), d(-1) {}             
  S004(int s_, int d_) : s(s_), d(d_) {}
  long s, d;
};

template<typename a>
struct S005 {
  typedef a e;
  std::vector<std::vector<a>> xs;
  const std::vector<a>& ys;
  long n;
  S005(const std::vector<a>& ys_, long n_) : ys(ys_), n(n_) {
    xs.resize(n);
    for(a x : ys) {
      a y = x;
      xs[x.s].push_back(y);
    }
  }
  const std::vector<a>& operator [] (long i) const {
    return xs[i];
  }
  long v() const {
    return n;
  }
  const std::vector<a>& es() const {
    return ys;
  }
};


struct Solver {
  long n, m;
  std::vector<std::array<long, 2>> xs;
  Solver() {
    S002 reader;
    reader >= n >= m >m>= xs;
  }
  void solve() {
    std::vector<S004> edges;
    for(std::array<long, 2> e : xs) {
      e[0] -= 1, e[1] -= 1;
      edges.push_back(S004(e[0], e[1]));
      edges.push_back(S004(e[1], e[0]));
    }
    S005<S004> graph(edges, n);
    std::vector<bool> visited(n, false);
    long res = dfs(graph, 0, visited, 0);
    printf("%ld\n", res);
  }
  long dfs(const S005<S004>& graph, long i, std::vector<bool>& visited, long d) {
    if( d == n - 1 ) return 1;
    long res = 0;
    visited[i] = true;
    for(S004 edge : graph[i]) {
      if( visited[edge.d] ) continue;
      res += dfs(graph, edge.d, visited, d + 1);
    }
    visited[i] = false;
    return res;
  }
};
 
int main() {
  loop std::unique_ptr<Solver>(new Solver())->solve();
  return 0;
}

Submission Info

Submission Time
Task C - One-stroke Path
User spica314
Language C++14 (GCC 5.4.1)
Score 300
Code Size 2866 Byte
Status AC
Exec Time 1 ms
Memory 256 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 300 / 300
Status
AC × 2
AC × 15
Set Name Test Cases
Sample sample_01.txt, sample_02.txt
All sample_01.txt, sample_02.txt, subtask_1_01.txt, subtask_1_02.txt, subtask_1_03.txt, subtask_1_04.txt, subtask_1_05.txt, subtask_1_06.txt, subtask_1_07.txt, subtask_1_08.txt, subtask_1_09.txt, subtask_1_10.txt, subtask_1_11.txt, subtask_1_12.txt, subtask_1_13.txt
Case Name Status Exec Time Memory
sample_01.txt AC 1 ms 256 KB
sample_02.txt AC 1 ms 256 KB
subtask_1_01.txt AC 1 ms 256 KB
subtask_1_02.txt AC 1 ms 256 KB
subtask_1_03.txt AC 1 ms 256 KB
subtask_1_04.txt AC 1 ms 256 KB
subtask_1_05.txt AC 1 ms 256 KB
subtask_1_06.txt AC 1 ms 256 KB
subtask_1_07.txt AC 1 ms 256 KB
subtask_1_08.txt AC 1 ms 256 KB
subtask_1_09.txt AC 1 ms 256 KB
subtask_1_10.txt AC 1 ms 256 KB
subtask_1_11.txt AC 1 ms 256 KB
subtask_1_12.txt AC 1 ms 256 KB
subtask_1_13.txt AC 1 ms 256 KB