oj.uz

Submission #883609

# Submission time Handle Problem Language Result Execution time Memory
883609 2023-12-05T13:50:49 Z mgl_diamond Trener (COCI20_trener) C++17
110 / 110
 169 ms 8568 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ii = pair<ll, ll>;
 
#define foru(i, l, r) for(int i=(l); i<=(r); ++i)
#define ford(i, l, r) for(int i=(l); i>=(r); --i)
#define fore(x, v) for(auto &x : v)
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
#define fi first
#define se second
#define file "input"

template<class T> bool minimize(T &a, T b) { if (a > b) { a = b; return 1; } return 0; }
template<class T> bool maximize(T &a, T b) { if (a < b) { a = b; return 1; } return 0; }

void setIO() {
  ios::sync_with_stdio(0);
  cin.tie(0); cout.tie(0);
  if (fopen(file".inp", "r")) {
    freopen(file".inp", "r", stdin);
    freopen(file".out", "w", stdout);
  }
}

const int MOD = 1e9+7, B = 256;
const int N = 51, K = 1501;
int n, k, dp[N][K];
int one[N][K], two[N][K];
string s[N][K];

int mul(int a, int b) {
  return 1LL * a * b % MOD;
}

void add(int &a, int b) {
  a += b;
  if (a >= MOD) a -= MOD;
}

int main() {
  setIO();

  cin >> n >> k;
  foru(i, 1, n) foru(j, 1, k) {
    cin >> s[i][j];
    foru(c, 0, i-2) one[i][j] = (1LL * one[i][j] * B % MOD + s[i][j][c]) % MOD;
    foru(c, 1, i-1) two[i][j] = (1LL * two[i][j] * B % MOD + s[i][j][c]) % MOD;
  }

  foru(i, 1, k) dp[1][i] = 1;
  foru(i, 1, n) {
    foru(j, 1, k) if (dp[i][j] > 0) {
      int hsh = 0;
      fore(c, s[i][j]) hsh = (1LL * hsh * B % MOD + c) % MOD;
      foru(c, 1, k) if (hsh == one[i+1][c] || hsh == two[i+1][c]) 
        add(dp[i+1][c], dp[i][j]);
    }
  }

  int ans = 0;
  foru(i, 1, k) add(ans, dp[n][i]);
  cout << ans;
}

Compilation message

trener.cpp: In function 'void setIO()':
trener.cpp:22:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |     freopen(file".inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
trener.cpp:23:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |     freopen(file".out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2908 KB Output is correct
2 Correct 1 ms 2908 KB Output is correct
3 Correct 1 ms 2908 KB Output is correct
4 Correct 1 ms 2864 KB Output is correct

Subtask #2
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 3672 KB Output is correct
2 Correct 5 ms 3676 KB Output is correct
3 Correct 5 ms 3676 KB Output is correct
4 Correct 5 ms 3676 KB Output is correct
5 Correct 5 ms 3676 KB Output is correct
6 Correct 5 ms 3676 KB Output is correct
7 Correct 5 ms 3672 KB Output is correct

Subtask #3
55.0 / 55.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2908 KB Output is correct
2 Correct 1 ms 2908 KB Output is correct
3 Correct 1 ms 2908 KB Output is correct
4 Correct 1 ms 2864 KB Output is correct
5 Correct 6 ms 3672 KB Output is correct
6 Correct 5 ms 3676 KB Output is correct
7 Correct 5 ms 3676 KB Output is correct
8 Correct 5 ms 3676 KB Output is correct
9 Correct 5 ms 3676 KB Output is correct
10 Correct 5 ms 3676 KB Output is correct
11 Correct 5 ms 3672 KB Output is correct
12 Correct 154 ms 8240 KB Output is correct
13 Correct 155 ms 8568 KB Output is correct
14 Correct 148 ms 8276 KB Output is correct
15 Correct 169 ms 8276 KB Output is correct
16 Correct 152 ms 8152 KB Output is correct
17 Correct 159 ms 8364 KB Output is correct
18 Correct 159 ms 8280 KB Output is correct
19 Correct 158 ms 8160 KB Output is correct
20 Correct 158 ms 8232 KB Output is correct
21 Correct 160 ms 8280 KB Output is correct
22 Correct 153 ms 8260 KB Output is correct