oj.uz

Submission #845263

# Submission time Handle Problem Language Result Execution time Memory
845263 2023-09-06T12:53:18 Z vjudge1 Trener (COCI20_trener) C++17
0 / 110
 10 ms 1884 KB 
#include <bits/stdc++.h>
using namespace std;
int main() {
  int N, K;
  cin >> N >> K;
  vector<map<string, int>> cnt(N);
  for (int i = 0;i < N; ++i) {
    for (int j = 0;j < K; ++j) {
      string s;
      cin >> s;
      cnt[i][s] += 1;
    }
  }
  int64_t mod = 1e9+7;
  map<string, int64_t> dp;
  for (int i = N-1;i >= 0; --i) {
    for (auto [s, c] : cnt[i]) {
      if (i == N-1) {
        dp[s] = 1;
      }
      string a = s;
      string b = s;
      reverse(b.begin(), b.end());
      a.pop_back();
      b.pop_back();
      reverse(b.begin(), b.end());
      dp[a] += c * dp[s];
      if (a != b) dp[b] += c * dp[s];
      dp[a] %= mod;
      dp[b] %= mod;
    }
  }
  int64_t ans = 0;
  for (auto [s, c] : cnt[0]) {
    ans += dp[s];
    ans %= mod;
  }
  cout << ans << '\n';
}

Subtask #1
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Incorrect 1 ms 348 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 33.0

# Verdict Execution time Memory Grader output
1 Incorrect 10 ms 1884 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 55.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Incorrect 1 ms 348 KB Output isn't correct
3 Halted 0 ms 0 KB -