Submission #1056999

#	Time	Username	Problem	Language	Result	Execution time	Memory
1056999		Thanhs	Kamenčići (COCI21_kamencici)	C++14	70 / 70	32 ms	175556 KiB

Main

#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
using namespace std;
#define int long long
// #define double long double
 
#define endl '\n'
#define fastIO ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
#define setmin(x, y) x = min((x), (y))
#define setmax(x, y) x = max((x), (y))
#define sqr(x) ((x) * (x))
#define fi first
#define se second
#define all(x) x.begin(), x.end()
 
// mt19937 hdp(chrono::high_resolution_clock::now().time_since_epoch().count());
// int rand(int l, int r){return l + ((hdp() % (r - l + 1)) + r - l + 1) % (r - l + 1);}

const int NM = 350 + 5;
const int inf = 1e9;

string s;
int pf[NM], sf[NM], n, k;
signed dp[NM][NM][NM];

bool DP(int l, int r, int c)
{
    if (~dp[l][r][c])
        return dp[l][r][c];
    dp[l][r][c] = 0;
    int o = pf[l - 1] + sf[r + 1] - c;
    if (c + (s[l] == 'C') < k)
        dp[l][r][c] |= !DP(l + 1, r, o);
    if (c + (s[r] == 'C') < k)
        dp[l][r][c] |= !DP(l, r - 1, o);
    return dp[l][r][c];
}

void solve()
{
    memset(dp, -1, sizeof dp);
    cin >> n >> k >> s;
    s = ' ' + s;
    for (int i = 1; i <= n; i++)
        pf[i] = pf[i - 1] + (s[i] == 'C');
    for (int i = n; i >= 1; i--)
        sf[i] = sf[i + 1] + (s[i] == 'C');
    cout << (DP(1, n, 0) ? "DA" : "NE");
}

signed main()
{
    fastIO
    if (fopen("in.txt", "r")) 
    {
        freopen("in.txt", "r", stdin);
        freopen("out.txt", "w", stdout);
    }
    int tc = 1;
    // cin >> tc;
    while (tc--)
        solve();
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:57:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |         freopen("in.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
Main.cpp:58:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   58 |         freopen("out.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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