제출 #1269524

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1269524		Bui_Quoc_Cuong	Uzastopni (COCI15_uzastopni)	C++20	0 / 160	4 ms	840 KiB

uzastopni

#include <bits/stdc++.h>
using namespace std;
// #define int long long
typedef long long ll;
typedef pair<int, int> ii;
typedef pair<int, ii> iii;

template<class T>
    bool minimize(T &a, const T &b) {
        if (a > b) return a = b, true;
        return false;
    }

template<class T>
    bool maximize(T &a, const T &b) {
        if (a < b) return a = b, true;
        return false;
    }

#define FOR(i, a, b) for (int i = a; i <= (int)b; i++)
#define FORD(i, a, b) for (int i = a; i >= (int)b; i--)
#define MASK(i) (1LL << (i))
#define BIT(S, i) (((S) >> (i)) & 1)
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define all(x) x.begin(), x.end()
const int N = 5e5 + 5;

int n, m;
int a[N];
vector <int> g[N];

void init(void) {
    cin >> n >> m;
    FOR(i, 1, n) cin >> a[i];
    FOR(i, 1, n - 1) {
    	int u, v; cin >> u >> v;
    	g[u].push_back(v);
    }
}

bitset <105> dp[10005][105];
bitset <105> f[105];

void dfs(int u) {
	for (int &v : g[u]) dfs(v);
	FOR(i, 1, m) f[i].reset();
	f[a[u]][a[u]] = 1;
	for (int &v : g[u]) {
		FOR(i, 1, m) f[i] |= dp[v][i];
	}
	FOR(i, 1, m) FOR(j, i, m) if (f[i][j]) f[i] |= f[j + 1];
	dp[u][a[u]][a[u]] = 1;
	FOR(i, 1, m) FOR(j, i, m) {
		if (i == a[u] && f[i + 1][j]) dp[u][i][j] = 1;
		else if (j == a[u] && f[i][j - 1]) dp[u][i][j] = 1;
		else if (f[i][a[u] - 1] && f[a[u] + 1][j]) dp[u][i][j] = 1;
	}
}

void process(void) {
	dfs(1);
	int ans = 0;
	FOR(i, 1, m) FOR(j, i, m) if (dp[1][i][j]) ans++;
	cout << ans;
}

signed main(void) {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);   
    #define taskname "uzastopni"
    if (fopen(taskname".inp", "r")) { 
        freopen(taskname".inp", "r", stdin); 
        freopen(taskname".out", "w", stdout);
    }
    init();
    process();
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

uzastopni.cpp: In function 'int main()':
uzastopni.cpp:75:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   75 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
uzastopni.cpp:76:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |         freopen(taskname".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 160