Submission #467206

#	Time	Username	Problem	Language	Result	Execution time	Memory
467206		BeanZ	Burza (COCI16_burza)	C++14	160 / 160	14 ms	1484 KiB

burza

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define endl '\n'
const int N = 405;
long long mod = 1e9 + 7;
const int lim = 4e5 + 5;
const int lg = 21;
const int base = 37;
const long double eps = 1e-6;
ll tin[N], tout[N], par[N][21], in[N], dp[(1 << 21)];
ll timer = 0;
vector<ll> node[N];
ll k;
void dfs(ll u, ll p, ll d){
    bool flag = false;
    tin[u] = 1e9;
    tout[u] = 0;
    for (auto j : node[u]){
        if (j == p) continue;
        for (int i = 1; i <= k; i++){
            par[j][i] = par[u][i];
        }
        if ((d + 1) <= k) par[j][d + 1] = j;
        dfs(j, u, d + 1);
        tin[u] = min(tin[u], tin[j]);
        tout[u] = max(tout[u], tout[j]);
        flag = true;
    }
    if ((d == k) && u != 1){
        timer++;
        tin[u] = timer;
        tout[u] = timer;
        in[timer] = u;
    }
}
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    if (fopen("tests.inp", "r")){
        freopen("test.inp", "r", stdin);
        freopen("test.out", "w", stdout);
    }
    ll n;
    cin >> n >> k;
    for (int i = 1; i < n; i++){
        ll u, v;
        cin >> u >> v;
        node[u].push_back(v);
        node[v].push_back(u);
    }
    if ((k * k) >= n) return cout << "DA", 0;
    dfs(1, 1, 0);
    dp[0] = 0;
    for (int i = 1; i < (1 << k); i++){
        for (int j = 0; j < k; j++){
            if (i & (1 << j)){
                ll id = dp[i ^ (1 << j)];
                dp[i] = max(dp[i], id);
                id++;
                dp[i] = max(dp[i], tout[par[in[id]][j + 1]]);
            }
        }
    }
    if (dp[(1 << k) - 1] == timer) cout << "DA";
    else cout << "NE";
}
/*
6 2
1 2
2 3
3 4
1 5
5 6
Ans:

Out:
*/

Compilation message (stderr)

burza.cpp: In function 'void dfs(long long int, long long int, long long int)':
burza.cpp:16:10: warning: variable 'flag' set but not used [-Wunused-but-set-variable]
   16 |     bool flag = false;
      |          ^~~~
burza.cpp: In function 'int main()':
burza.cpp:41:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |         freopen("test.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
burza.cpp:42:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |         freopen("test.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 16 / 16
• Subtask 2: 16 / 16
• Subtask 3: 16 / 16
• Subtask 4: 16 / 16
• Subtask 5: 16 / 16
• Subtask 6: 16 / 16
• Subtask 7: 16 / 16
• Subtask 8: 16 / 16
• Subtask 9: 16 / 16
• Subtask 10: 16 / 16