Submission #780028

#	Time	Username	Problem	Language	Result	Execution time	Memory
780028		cig32	Kamenčići (COCI21_kamencici)	C++17	70 / 70	18 ms	27480 KiB

Main

#include "bits/stdc++.h"
using namespace std;
#define int long long
const int MAXN = 1e6 + 10;
const int MOD = 998244353;
mt19937_64 rng((int)std::chrono::steady_clock::now().time_since_epoch().count());
int rnd(int x, int y) {
  int u = uniform_int_distribution<int>(x, y)(rng); return u;
}
int bm(int b, int p) {
  if(p==0) return 1 % MOD;
  int r = bm(b, p >> 1);
  if(p&1) return (((r*r) % MOD) * b) % MOD;
  return (r*r) % MOD;
}
int inv(int b) { 
  return bm(b, MOD-2);
}
int fastlog(int x) {
  return (x == 0 ? -1 : 64 - __builtin_clzll(x) - 1);
}
void printcase(int i) { cout << "Case #" << i << ": "; }

bool dp[351][351][351];
bool vis[351][351][351];
int n,k;
char c[351];
int ps[351];
bool dpf(int l, int r, int x) {
  if(x >= k) return dp[l][r][x] = 0;
  if(vis[l][r][x]) return dp[l][r][x];
  vis[l][r][x] = 1;
  int y = ps[n] - ps[r] + ps[l-1] - x;
  if(x+(c[l]=='C') < k && dpf(l+1,r,y) == 0) return dp[l][r][x] = 1;
  if(x+(c[r]=='C') < k && dpf(l,r-1,y) == 0) return dp[l][r][x] = 1;
  return dp[l][r][x] = 0;
}
void solve(int tc){
  cin >> n >> k;
  for(int i=1; i<=n; i++) cin >> c[i];
  for(int i=1; i<=n; i++) ps[i] = ps[i-1] + (c[i] == 'C');
  cout << (dpf(1, n, 0) ? "DA\n" : "NE\n");
}
int32_t main() {
  ios::sync_with_stdio(0); cin.tie(0);
  int t = 1; //cin >> t;
  for(int i=1; i<=t; i++) solve(i);
}
// 勿忘初衷

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