Submission #641307

#	Time	Username	Problem	Language	Result	Execution time	Memory
641307		Cookie	Regions (IOI09_regions)	C++14	35 / 100	4849 ms	97492 KiB

regions

#include<bits/stdc++.h>
 
using namespace std;
#include<fstream>
 
#define ll long long
#define vt vector
#define pb push_back
#define fi first
#define se second
#define forr(i, a, b) for(int i = a; i < b; i++)
#define dorr(i, a, b) for(int i = a; i >= b; i--)
typedef unsigned long long ull;
 
#define pii pair<int, int>
 
#define pll pair<ll, ll>
#include<fstream>
 
ifstream fin("milkorder.in");
ofstream fout("milkorder.out");
 
const ll mod = 1e9 + 7;
const int mxn = 2e5, mxr = 25e3, sq = 446;
int n, r, q, t = 0;
vt<int>adj[mxn + 1], ob[mxn + 1];
vt<int>reg[mxr + 3];
int in[mxn + 1], out[mxn + 1], color[mxn + 1], h[mxn + 1];
map<int, int>mp[mxr + 1];
void dfs(int s){
    in[s] = ++t;
    color[t] = h[s];
    for(auto i: adj[s]){
        
        dfs(i);
        
    }
    out[s] = t;
}
void dfs2(int co, int s, int cnt){
    for(auto i: adj[s]){
        mp[co][h[i]] += cnt;
        dfs2(co, i, cnt + (h[i] == cnt));
    }
}
int main(){
     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n >> r >> q;
    cin >> h[1]; reg[h[1]].pb(1);
    forr(i, 2, n + 1){
        int v; cin >> v >> h[i];
        reg[h[i]].pb(i);
        adj[v].pb(i);
    }
    for(int i = 1; i <= r; i++){
        if(reg[i].size() >= sq){
            dfs2(i, 1, (h[1] == i));
        }
        
    }
    dfs(1);
    forr(i, 1, n + 1)ob[color[i]].pb(i);
    for(int i = 0; i < q; i++){
    
        int r1, r2; cin >> r1 >> r2;
        if(reg[r1].size() >= sq){
            cout << mp[r1][r2] << endl;
        }else{
        int ans = 0;
        for(auto j: reg[r1]){
            ans += upper_bound(ob[r2].begin(), ob[r2].end(), out[j]) - lower_bound(ob[r2].begin(), ob[r2].end(), in[j]);
            
        }
        cout << ans << endl;
        }
    }
}

• Subtask 1: 15 / 15
• Subtask 2: 20 / 85