Submission #465925

#	Time	Username	Problem	Language	Result	Execution time	Memory
465925		Yuisuyuno	Burza (COCI16_burza)	C++14	160 / 160	12 ms	1408 KiB

burza

//Nguyen Huu Hoang Minh
#include <bits/stdc++.h>
#define sz(x) int(x.size())
#define all(x) x.begin(),x.end()
#define reset(x) memset(x, 0,sizeof(x))
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define N 405
#define remain(x) if (x > MOD) x -= MOD
#define ii pair<int, int>
#define iiii pair< ii , ii >
#define viiii vector< iiii >
#define vi vector<int>
#define vii vector< ii >
#define bit(x, i) (((x) >> (i)) & 1)
#define Task "test"
#define int long long

using namespace std;

typedef long double ld;
const int inf = 1e10;
const int minf = -1e10;

int n, k;
vector<int> g[N];
int dp[1<<20];
int d[N];
ii resp[N];
int par[N][20];
int cnt;

void readfile()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);cout.tie(0);
    if (fopen(Task".inp","r"))
    {
        freopen(Task".inp","r",stdin);
        //freopen(Task".out","w",stdout);
    }
    cin >> n >> k;
    if (k*k >= n){
        cout << "DA";
        exit(0);
    }
    for(int i=1; i<n; i++){
        int u, v;
        cin >> u  >> v;
        g[u].pb(v); g[v].pb(u);
    }
}

void dfs(int u, int pre){
    if (d[u]==k){
        resp[u] = {cnt,cnt};
        cnt++;
        return;
    }
    resp[u].fi = cnt;
    for(auto v : g[u]){
        if (v!=pre){
            d[v] = d[u]+1;
            dfs(v,u);
            resp[u].se = cnt-1;
        }
    }
}

void proc()
{
    for(int i=1; i<=n; i++) resp[i] = ii(0,-1);
    d[1] = 0;
    dfs(1,0);
    //for(int i=1; i<=n; i++) cout << i << ' ' << resp[i].fi << ' ' << resp[i].se << endl;
    for(int i=1; i<=n; i++){
        par[resp[i].fi][d[i]-1]=max(par[resp[i].fi][d[i]-1],resp[i].se+1);
    }
    for(int i=1; i<20; i++){
        for(int j=1; j<=cnt+1; j++){
            par[j][i] = max(par[j][i],par[j-1][i]);
        }
    }
    for(int i=0; i<(1<<k); i++){
        for(int j=0; j<k; j++){
            if (!(i&(1<<j))) dp[i^(1<<j)] = max(dp[i^(1<<j)],par[dp[i]][j]);
        }
    }
    if (dp[(1<<k)-1]==cnt)cout <<"DA";
    else cout << "NE";
}

signed main()
{
    readfile();
    proc();
    return 0;
}

Compilation message (stderr)

burza.cpp: In function 'void readfile()':
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(Task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• 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