Submission #907799

#	Time	Username	Problem	Language	Result	Execution time	Memory
907799		trMatherz	Regions (IOI09_regions)	C++17	21 / 100	2240 ms	131072 KiB

regions

#include <iostream> //cin, cout

/*
#include <fstream>
std::ifstream cin ("ex.in");
std::ofstream cout ("ex.out");
*/




// includes
#include <cmath> 
#include <set>
#include <map>
#include <queue>
#include <string>
#include <vector>
#include <array>
#include <algorithm>
#include <numeric>
#include <iomanip>
#include <unordered_set>
#include <stack>
#include <ext/pb_ds/assoc_container.hpp>
#include <random>
#include <chrono>



//usings 
using namespace std;
using namespace __gnu_pbds;


// misc
#define ll long long
#define pb push_back
#define pq priority_queue
#define ub upper_bound
#define lb lower_bound
template<typename T, typename U> bool emin(T &a, const U &b){ return b < a ? a = b, true : false; }
template<typename T, typename U> bool emax(T &a, const U &b){ return b > a ? a = b, true : false; }
typedef uint64_t hash_t;

// vectors
#define vi vector<int>
#define vvi vector<vi>
#define vvvi vector<vvi>
#define vpii vector<pair<int, int>>
#define vvpii vector<vector<pair<int, int>>>
#define vppipi vector<pair<int, pair<int, int>>>
#define vl vector<ll>
#define vvl vector<vl>
#define vvvl vector<vvl>
#define vpll vector<pair<ll, ll>>
#define vb vector<bool>
#define vvb vector<vb>
#define vs vector<string>
#define sz(x) (int)x.size()
#define rz resize
#define all(x) x.begin(), x.end()


// pairs
#define pii pair<int, int>
#define pll pair<ll, ll>
#define mp make_pair
#define f first
#define s second

// sets
#define si set<int>
#define sl set<ll>
#define ss set<string>
#define in insert
template <class T> using iset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

// maps
#define mii map<int, int>
#define mll map<ll, ll>

// loops
#define FR(x, z, y) for (int x = z; x < y; x++)
#define FRE(x, z, y) FR(x, z, y + 1)
#define F(x, y) FR(x, 0, y)
#define FE(x, y) F(x, y + 1)
#define A(x, y) for(auto &x : y)

int n, r, q;
vvi a;
vvi v;
vvi b;
vi c;
vi s, e;
int ct = 0;
vvi p;
int sr; 


void dfs(int x, mii cur){
    A(u, cur) p[u.f][c[x]]++;
    if(sz(v[c[x]]) >= sr){
        if(cur.find(c[x]) == cur.end()) cur[c[x]] = 1;
        else cur[c[x]]++;
    }
    s[x] = ct++;
    b[c[x]].pb(ct - 1);
    A(u, a[x]) dfs(u, cur);
    e[x] = ct - 1;
}
int main(){
    cin >> n >> r >> q;
    c = s = e = vi(n);
    p = vvi(r, vi(r, 0));
    a = vvi(n); v = b = vvi(r); cin >> c[0]; v[--c[0]].pb(0);
    FR(i, 1, n){int x; cin >> x; a[--x].pb(i); cin >> c[i]; v[--c[i]].pb(i);}
    sr = (int) sqrt(n);
    mii tempm;
    dfs(0, tempm);
    while(q--){
        int x, y; cin >> x >> y; x--; y--;
        int an = 0;
        if(sz(v[x]) < sr){
            A(u, v[x]){
                int w = e[u];
                int l = s[u];
                an += (ub(all(b[y]), w) - b[y].begin()) - (ub(all(b[y]), l) - b[y].begin());
            }
        } else {
            an = p[x][y];
        }
        cout << an << endl;
    }
    return 0;
}

• Subtask 1: 11 / 15
• Subtask 2: 10 / 85