Submission #495999

#	Time	Username	Problem	Language	Result	Execution time	Memory
495999		Ziel	Birthday gift (IZhO18_treearray)	C++17	100 / 100	1545 ms	91716 KiB

treearray

/**
 * LES GREATEABLES BRO TEAM
**/

#include <bits/stdc++.h>

using namespace std;

using ll = long long;
#define sz(x) (int)x.size()
const bool FLAG = false;
void setIO(const string &f = "");

string to_string(const string s) {
	return '"' + s + '"';
}
string to_string(const char c) {
 	return char(39) + string(1, c) + char(39);
}
string to_string(const char* s) {
 	return to_string(string(s));
}
string to_string(bool f) {
	return (f ? "true" : "false");
}
template<class A, class B>
string to_string(const pair<A, B> x) {
	return "(" + to_string(x.first) + ", " + to_string(x.second) + ")";
}
template<class A, class B, class C>
string to_string(const tuple<A, B, C> x) {
	return "(" + to_string(get<0>(x)) + ", " + to_string(get<1>(x)) + ", " + to_string(get<2>(x)) + ")";
}
template<class A, class B, class C, class D>
string to_string(const tuple<A, B, C, D> x) {
	return "(" + to_string(get<0>(x)) + ", " + to_string(get<1>(x)) + ", " + to_string(get<2>(x)) + ", " + to_string(get<3>(x)) + ")";
}
template<class T>
string to_string(const T v) {
	string res = "{"; bool f = true;
	for (auto x: v)
		res += (f ? to_string(x) : ", " + to_string(x)), f = false;
	return res + "}";
}
void debug_args() { cerr << "]\n"; }
template<class H, class... T>
void debug_args(H x, T... y) {
	cerr << to_string(x);
	if (sizeof... (y))
	cerr << ", ";
	debug_args(y...);
}

#ifdef LOCAL
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]: [", debug_args(__VA_ARGS__);
#else
#define debug(...) 47
#endif

const int N = 3e5 + 14;

int n, m, q, level[N], up[22][N], a[N];
vector<vector<int>> g(N);

void dfs(int v, int pr) {
	level[v] = level[pr] + 1;
	up[0][v] = pr;
	for (int i = 1; i <= 20; i++)
		up[i][v] = up[i - 1][up[i - 1][v]];
	for (int to: g[v]) {
		if (to == pr)
			continue;
		dfs(to, v);
	}
}
int lca(int x, int y) {
	if (level[x] > level[y])
		swap(x, y);
	for (int i = 20; i >= 0; i--) {
		if (level[up[i][y]] >= level[x])
			y = up[i][y];
	}
	if (x == y)
		return x;
   	for (int i = 20; i >= 0; i--) {
   		if (up[i][x] != up[i][y])
   			x = up[i][x], y = up[i][y];
   	}
   	return up[0][x];
}

void solve() {
    cin >> n >> m >> q;
    for (int i = 1, x, y; i < n; i++) {
    	cin >> x >> y;
    	g[x].push_back(y), g[y].push_back(x);
    }
    dfs(1, 0);
    for (int i = 1; i <= m; i++)
    	cin >> a[i];
    vector<int> b(m + 1);
    set<int> s1[n + n], s2[n + n];
    for (int i = 1; i < m; i++) {
    	b[i] = lca(a[i], a[i + 1]);
    	s1[b[i]].insert(i);
    	s2[a[i]].insert(i);
    }
    s2[a[m]].insert(m);

    while (q--) {
    	int type;
    	cin >> type;
    	if (type == 1) {
    		int pos, v;
    		cin >> pos >> v;
    		s2[a[pos]].erase(pos);
    		a[pos] = v;
    		s2[a[pos]].insert(pos);
    		if (pos + 1 <= m) {
    			s1[b[pos]].erase(pos);
	    		b[pos] = lca(a[pos], a[pos + 1]);
	    		s1[b[pos]].insert(pos);
	    	}
	    	if (pos - 1 >= 1) {
	    		s1[b[pos - 1]].erase(pos - 1);
	    		b[pos - 1] = lca(a[pos - 1], a[pos]);
	    		s1[b[pos - 1]].insert(pos - 1);
	    	}
    	} else {
    		int l, r, v;
    		cin >> l >> r >> v;
    		bool found = 0;
    		if (sz(s2[v])) {
    			auto it = s2[v].lower_bound(l);
    			if (it != s2[v].end() && *it <= r) {
    				cout << *it << ' ' << *it << '\n';
    				found = 1;
    			}
    		}
    		if (!found && sz(s1[v])) {
    			auto it = s1[v].lower_bound(l);
    			if (it != s1[v].end() && *it <= r - 1) {
    				cout << *it << ' ' << (*it) + 1 << '\n';
    				found = 1;
    			}
    		}
    		if (!found)
    			cout << "-1 -1\n";
    	}
    }
}

signed main() {
    setIO();
    
    int tt = 1;
    if (FLAG) {
    	cin >> tt;
    }
    while (tt--) {
    	solve();
    }
    
    return 0;
}

void setIO(const string &f) {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    if (fopen((f + ".in").c_str(), "r")) {
        freopen((f + ".in").c_str(), "r", stdin);
        freopen((f + ".out").c_str(), "w", stdout);
    }
}

Compilation message (stderr)

treearray.cpp: In function 'void setIO(const string&)':
treearray.cpp:171:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  171 |         freopen((f + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
treearray.cpp:172:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  172 |         freopen((f + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 12 / 12
• Subtask 2: 18 / 18
• Subtask 3: 26 / 26
• Subtask 4: 44 / 44