Submission #773643

#	Time	Username	Problem	Language	Result	Execution time	Memory
773643		PoPularPlusPlus	Two Currencies (JOI23_currencies)	C++17	100 / 100	832 ms	45348 KiB

currencies

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long 
#define pb(e) push_back(e)
#define sv(a) sort(a.begin(),a.end())
#define sa(a,n) sort(a,a+n)
#define mp(a,b) make_pair(a,b)
#define vf first
#define vs second
#define ar array
#define all(x) x.begin(),x.end()
const int inf = 0x3f3f3f3f;
const int mod = 1000000007; 
const double PI=3.14159265358979323846264338327950288419716939937510582097494459230;

mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());

bool remender(ll a , ll b){return a%b;}

//freopen("problemname.in", "r", stdin);
//freopen("problemname.out", "w", stdout);

const int N = 100002 , L = 20;

struct query {
	int start,end;
	ll gold , silver;
	int l , r , ans , left, right , left1, right1;
};

vector<pair<int,int>> adj[N];
vector<pair<int,int>> check_points[N];
vector<int> tp;
int start[N],tin[N],tout[N];
vector<pair<ll,int>> arr;
vector<query> queries(N);
int up[N][L],in[N],out[N],timer;

void dfs(int node , int par){
	start[node] = tp.size();
	in[node] = timer++;
	up[node][0] = par;
	for(int i = 1; i < L; i++){
		up[node][i] = up[up[node][i-1]][i-1];
	}
	for(auto i : adj[node]){
		if(i.vf == par)continue;
		for(auto j : check_points[i.vs]){
			tin[j.vs] = tp.size();
			tp.pb(j.vf);
		}
		dfs(i.vf , node);
		for(auto j : check_points[i.vs]){
			tout[j.vs] = tp.size();
			tp.pb(j.vf);
		}
	}
	out[node] = timer++;
}

bool is_lca(int x , int y){
	return in[x] <= in[y] && out[x] >= out[y];
}

int find(int x , int y){
	if(is_lca(x,y))return x;
	if(is_lca(y,x))return y;
	for(int i = L - 1; i >= 0; i--){
		if(!is_lca(up[x][i],y))x = up[x][i];
	}
	return up[x][0];
}

struct Fen {
	int n;
	vector<ll> tree;
	
	void init(int n1){
		n = n1;
		tree.assign(n + 1 , 0);
	}
	
	void set(int i , ll val){
		i++;
		while(i <= n){
			tree[i] += val;
			i += (i & -i);
		}
	}
	
	ll sum(int i){
		i++;
		ll res = 0;
		while(i > 0){
			res += tree[i];
			i -= (i & -i);
		}
		return res;
	}
};

int n , m , q;
Fen ft,ft1;

void pbs(){
	vector<int> v[m + 1];
	ft.init(2*m + 1);
	ft1.init(2*m + 1);
	for(int i = 0; i < q; i++){
		if(queries[i].l <= queries[i].r){
			v[(queries[i].l + queries[i].r)/2].pb(i);
		}
	}
	for(int i = 0; i < m; i++){
		ft.set(tin[arr[i].vs],arr[i].vf);
		ft.set(tout[arr[i].vs],-arr[i].vf);
	}
	
	for(int i : v[m]){
		ll sum = ft.sum(queries[i].right) - ft.sum(queries[i].left-1);
		sum += ft.sum(queries[i].right1) - ft.sum(queries[i].left1-1);
		if(sum <= queries[i].silver){
			queries[i].ans = 0;
			queries[i].l = m+1;
		}
		else {
			queries[i].r = m - 1;
		}
	}
	for(int j = m - 1; j >= 0; j--){
		ft.set(tin[arr[j].vs],-arr[j].vf);
		ft.set(tout[arr[j].vs],arr[j].vf);
		ft1.set(tin[arr[j].vs],1);
		ft1.set(tout[arr[j].vs],-1);
		for(int i : v[j]){
			ll sum = ft.sum(queries[i].right) - ft.sum(queries[i].left-1);
			sum += ft.sum(queries[i].right1) - ft.sum(queries[i].left1-1);
			int cnt = ft1.sum(queries[i].right) - ft1.sum(queries[i].left-1);
			cnt += ft1.sum(queries[i].right1) - ft1.sum(queries[i].left1-1);
			if(sum <= queries[i].silver){
				queries[i].ans = cnt;
				queries[i].l = j+1;
			}
			else {
				queries[i].r = j - 1;
			}
		}
	}
}

void solve(){
	cin >> n >> m >> q;
	for(int i = 0; i < n - 1; i++){
		int a , b;
		cin >> a >> b;
		adj[a].pb(mp(b,i+1));
		adj[b].pb(mp(a,i+1));
	}
	for(int i = 0; i < m; i++){
		ll p , c;
		cin >> p >> c;
		check_points[p].pb(mp(c,i));
		arr.pb(mp(c,i));
	}
	
	timer = 0;
	dfs(1,1);
		
	sort(all(arr));
	for(int i = 0; i < q; i++){
		ll s , t , x , y;
		cin >> s >> t >> x >> y;
		int left , right , left1 , right1;
		int lca = find(s,t);
		if(lca == s){
			left = start[s];
			right = start[t]-1;
			left1 = 0;
			right1 = -1;
		}
		else if(lca == t){
			left = start[t];
			right = start[s]-1;
			left1 = 0;
			right1 = -1;
		}
		else {
			left = start[lca];
			right = start[s]-1;
			left1 = start[lca];
			right1 = start[t]-1;
		}
		//cout << left << ' ' << right << ' ' << left1 << ' ' << right1 << '\n';
		queries[i] = {s,t,x,y,0,m,-1,left,right,left1,right1};
	}
		
	for(int i = 0; i < L; i++){
		pbs();
	}
	
	for(int i = 0; i < q; i++){
		if(queries[i].ans == -1 || queries[i].ans > queries[i].gold)cout << -1 << '\n';
		else cout << queries[i].gold - queries[i].ans << '\n';
	}
}

int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
	//int t;cin >> t;while(t--)
	solve();
	return 0;
}

Compilation message (stderr)

currencies.cpp: In function 'void solve()':
currencies.cpp:195:17: warning: narrowing conversion of 's' from 'long long int' to 'int' [-Wnarrowing]
  195 |   queries[i] = {s,t,x,y,0,m,-1,left,right,left1,right1};
      |                 ^
currencies.cpp:195:19: warning: narrowing conversion of 't' from 'long long int' to 'int' [-Wnarrowing]
  195 |   queries[i] = {s,t,x,y,0,m,-1,left,right,left1,right1};
      |                   ^

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