Submission #898785

#	Time	Username	Problem	Language	Result	Execution time	Memory
898785		duckindog	Kamenčići (COCI21_kamencici)	C++14	70 / 70	76 ms	365908 KiB

Main

// from duckindog wth depression
#include<bits/stdc++.h>

using namespace std;

const int N = 350 + 10;
int n, k;
int a[N], d[N];
int f[N][N][2][N];
bool dp(int l, int r, int t, int x) {
  if (x == k) return 0;
  if (d[l - 1] + d[n] - d[r] - x == k) return 1;
  auto &ret = f[l][r][t][x];
  if (ret > -1) return ret;
  if (t) {
    auto lt = dp(l + 1, r, 1 - t, x + a[l]);
    auto rt = dp(l, r - 1, 1 - t, x + a[r]);
    ret = lt | rt;
  } else {
    auto lt = dp(l + 1, r, 1 - t, x);
    auto rt = dp(l, r - 1, 1 - t, x);
    ret = lt & rt;
  }
  return ret;
}

int32_t main() {
  cin.tie(0)->sync_with_stdio(0);

  if (fopen("duck.inp", "r")) {
    freopen("duck.out", "w", stdout);
    freopen("duck.inp", "r", stdin);
  }
  memset(f, -1, sizeof f);
  cin >> n >> k;
  for (int i = 1; i <= n; ++i) {
    char x; cin >> x;
    a[i] = x == 'C';
    d[i] = d[i - 1] + a[i];
  }
  cout << (dp(1, n, 1, 0) == 1 ? "DA" : "NE");
}

Compilation message (stderr)

Main.cpp: In function 'int32_t main()':
Main.cpp:31:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |     freopen("duck.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:32:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |     freopen("duck.inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 40 / 40