Submission #888670

#	Time	Username	Problem	Language	Result	Execution time	Memory
888670		vjudge1	Two Currencies (JOI23_currencies)	C++17	0 / 100	16 ms	14268 KiB

currencies

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

#define int long long
#define ff first
#define ss second
#define all(a) a.begin(), a.end()
const int mod = 998244353;
const int N = 1e5;


int n, m, q;
vector<int > g[N+10];
vector< pair<int, int> > check, edge;
int depth[N+10], sub[N+10];
int up[N+10][18], sum[N+10][18];
int tin[N+10], tout[N+10];
vector<int> val[N+10];
int bigchild[N+10], pos[N+10], chain[N+10];
int timer = 1;

void dfs(int v, int par){
	tin[v] = timer++;
	up[v][0] = par;
	for(int to : g[v]){
		if(to == par) continue;
		depth[to] = depth[v] + 1;
		dfs(to, v);
		sub[v]+= sub[to];
		if(!bigchild[v] or sub[bigchild[v]] < sub[to]){
			bigchild[v] = to;
		}
	}
	sub[v] += 1, tout[v] = timer;
}


int upper(int p, int a){
	return (tin[p] <= tin[a] && tout[p] >= tout[a]);
}


int lca(int a, int b){
	/*if(depth[b] < depth[a]) swap(a, b);
	int k = depth[b] - depth[a];
	for(int i = 0;i < 18; i++){
		if(k & (1<<i)) b = up[b][i];
	}
	if(a == b) return a;
	for(int i = 17; i >= 0; i--){
		if(up[b][i] != up[a][i]){
			a = up[a][i];
		}
	}
	return up[a][0];
	*/
	int mn = INT_MAX, ans = -1;
	for(int i = 1;i <= n; i++){
		if(upper(i, a) && upper(i, b) && mn > depth[i]){
			ans = i;
			mn = depth[i];
		}
	}
	return ans;
}

void dfs2(int v, int par, int head){
	pos[v] = timer++;
	chain[v] = head;
	if(bigchild[v]){
		dfs2(bigchild[v], v, head);
	}
	for(int to : g[v]){
			if(to == par || to == bigchild[v]) continue;
			dfs2(to, v, to);
	}
}




int query(int a, int b){
	if(chain[a] > chain[b]) swap(a, b);
	int sum = 0;
	while(chain[a] != chain[b]){
			if(chain[a] > chain[b]) swap(a, b);
			int l =pos[chain[b]], r = pos[b];
			//sum+= get(l, r, 1, 1, n);
			b = up[chain[b]][0];
	}
	if(chain[a] > chain[b]) swap(a, b);
	int l = pos[a], r = pos[b];
	//sum+= get(l, r, 1, 1, n);
	return sum; 
}




signed main(){
	ios::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	cin >> n >> m >> q;
	for(int i = 1;i < n; i++){
		int a, b; cin >> a >> b;
		edge.push_back({a, b});
		g[a].push_back(b);
		g[b].push_back(a);
	}
	
	dfs(1, 1);
	timer = 1;
	dfs2(1, 1, 1);
	int coins = 0;
	for(int i = 0;i < m; i++){
		int p, c; cin >> p >> c;
		check.push_back({p, c});
		int a = edge[p-1].ff, b = edge[p-1].ss;
		if(depth[a] < depth[b]) swap(a, b);
		sum[a][0] += 1;
		val[a].push_back(c);
		coins = c;
	}
	for(int j = 1;j < 18; j++){
		for(int i = 1;i <= n; i++){
			up[i][j] = up[up[i][j-1]][j-1];
			sum[i][j] = sum[i][j-1] + sum[up[i][j-1]][j-1];
		}
	}
	if(max({n, m, q}) <= 2000){
		while(q--){
			int s, t; cin >> s >> t;
			int x, y; cin >> x >> y;
			int lc = lca(s, t);
			vector<pair<int, int> > vec;
			while(s != lc){
				for(int x : val[s]) vec.push_back({x, 1});
				s = up[s][0];
			}
			while(t != lc){
				for(int x : val[t]) vec.push_back({x, 1});
				t = up[t][0];
			}
			sort(all(vec), [&](auto A, auto B){
				return A.ff < B.ff;
			});
			for(auto [silver, gold] : vec){
			//	cout << silver << ' ' << gold << ", ";
				if(y >= silver){
					y-= silver;
				}else{
					x-= gold;
				}
			}
			//cout << '\n';
			cout << max(-1LL, x) << '\n';
		}
		return 0;
	}
	
	
	return 0;
}

Compilation message (stderr)

currencies.cpp: In function 'long long int query(long long int, long long int)':
currencies.cpp:87:8: warning: unused variable 'l' [-Wunused-variable]
   87 |    int l =pos[chain[b]], r = pos[b];
      |        ^
currencies.cpp:87:26: warning: unused variable 'r' [-Wunused-variable]
   87 |    int l =pos[chain[b]], r = pos[b];
      |                          ^
currencies.cpp:92:6: warning: unused variable 'l' [-Wunused-variable]
   92 |  int l = pos[a], r = pos[b];
      |      ^
currencies.cpp:92:18: warning: unused variable 'r' [-Wunused-variable]
   92 |  int l = pos[a], r = pos[b];
      |                  ^
currencies.cpp: In function 'int main()':
currencies.cpp:114:6: warning: variable 'coins' set but not used [-Wunused-but-set-variable]
  114 |  int coins = 0;
      |      ^~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 28
• Subtask 3: 0 / 30
• Subtask 4: 0 / 32