제출 #1275521

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1275521		chanhchuong123	Burza (COCI16_burza)	C++20	160 / 160	33 ms	868 KiB

burza

#include<bits/stdc++.h>
using namespace std;

const bool multiTest = false;
#define task "C"
#define fi first
#define se second
#define MASK(i) (1LL << (i))
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define BIT(mask, i) ((mask) >> (i) & 1)

template<typename T1, typename T2> bool minimize(T1 &a, T2 b) {
	if (a > b) a = b; else return 0; return 1;
}
template<typename T1, typename T2> bool maximize(T1 &a, T2 b) {
	if (a < b) a = b; else return 0; return 1;
}

const int MAX = 404;
int n, k;
int ll[MAX];
int rr[MAX];
int dp[1 << 20];
vector<int> leaves;
vector<int> adj[MAX];
vector<int> nodes[MAX];

void dfs(int u, int p, int depth) {
    nodes[depth].push_back(u);
    ll[u] = n + 1;
    rr[u] = 0 + 0;
    if (depth == k) {
        ll[u] = rr[u] = leaves.size() + 1;
        leaves.push_back(u);
        return;
    }
    for (int v: adj[u]) if (v != p) {
        dfs(v, u, depth + 1);
        minimize(ll[u], ll[v]);
        maximize(rr[u], rr[v]);
    }
}

void process(void) {
    cin >> n >> k;
    for (int i = 1; i < n; ++i) {
        int u, v; cin >> u >> v;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }

    if (k * k >= n) {
        cout << "DA";
        return;
    }
    dfs(1, -1, 0);

    for (int mask = 0; mask < (1 << k); ++mask) {
        for (int i = 0; i < k; ++i) if (!(mask >> i & 1)) {
            for (int u: nodes[i + 1]) if (ll[u] <= dp[mask] + 1) {
                maximize(dp[mask | (1 << i)], rr[u]);
            }
        }
    }

    if (dp[(1 << k) - 1] == leaves.size()) {
        cout << "DA";
        return;
    }

    cout << "NE";
}

int main(void) {
	ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
	if (fopen(task".inp", "r")) {
		freopen(task".inp", "r",  stdin);
		freopen(task".out", "w", stdout);
	}

	int nTest = 1; if (multiTest) cin >> nTest;
	while (nTest--) {
		process();
	}

	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

burza.cpp: In function 'int main()':
burza.cpp:78:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |                 freopen(task".inp", "r",  stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
burza.cpp:79:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   79 |                 freopen(task".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