#include <bits/stdc++.h> using namespace std; #define ll long long #define eb emplace_back #define pb push_back #define fi first #define se second #define ii pair<int,int> #define ve vector #define all(x) x.begin(), x.end() #define fo(i,a,b) for (int i=(a); i<=(b); ++i) #define fd(i,a,b) for (int i=(a); i>=(b); --i) #define maxi(a, b) a = max(a, b) #define mini(a, b) a = min(a, b) #define siz(x) ((int)(x).size()) #define vi ve<int> #define _ << ' ' << const int N = 355, inf = 1e9+10, mod = 1e9+7; bool MBE; /** **/ int n, k, a[N], pre[N], suf[N], dp[N][N][N][2]; /// 2 dau i, j, va A da co k vien da do int f(int l, int r, int x, int turn) { int y = pre[l-1]+suf[r+1]-x; if (x >= k) { return (turn == 1); } if (y >= k) { return (turn == 0); } int &ans = dp[l][r][x][turn]; if (ans != -1) return ans; ans = 0; int nxl = (turn == 0 ? x+a[l] : x); int nxr = (turn == 0 ? x+a[r] : x); if (f(l+1, r, nxl, turn^1) == 0) ans = 1; if (f(l, r-1, nxr, turn^1) == 0) ans = 1; return ans; } void sol() { cin >> n >> k; fo(i,1,n) { char c; cin >> c; a[i] = (c == 'C'); } fo(i,1,n) { pre[i]=pre[i-1]+a[i]; } fd(i,n,1) { suf[i]=suf[i+1]+a[i]; } memset(dp,-1,sizeof(dp)); int ans = f(1, n, 0, 0); cout << (ans == 1 ? "DA" : "NE"); } bool MED; signed main(){ ios::sync_with_stdio(0); cin.tie(0); if(fopen("A.inp","r")) { freopen("A.inp","r",stdin); freopen("A.out","w",stdout); } int tc = 1; // cin >> tc; fo(i,1,tc) sol(); // cerr << "Memory = " << abs(&MED - &MBE)/1024.0/1024.0 << " MB"; return 0; }

Main.cpp: In function 'int main()':
Main.cpp:72:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |         freopen("A.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~
Main.cpp:73:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |         freopen("A.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~