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답안 #966766

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
966766 2024-04-20T10:13:38 Z bachhoangxuan Regions (IOI09_regions) C++17
100 / 100
 1853 ms 53616 KB 
// Judges with GCC >= 12 only needs Ofast
// #pragma GCC optimize("O3,no-stack-protector,fast-math,unroll-loops,tree-vectorize")
// MLE optimization
// #pragma GCC optimize("conserve-stack")
// Old judges
// #pragma GCC target("sse4.2,popcnt,lzcnt,abm,mmx,fma,bmi,bmi2")
// New judges. Test with assert(__builtin_cpu_supports("avx2"));
// #pragma GCC target("avx2,popcnt,lzcnt,abm,bmi,bmi2,fma,tune=native")
// Atcoder
// #pragma GCC target("avx2,popcnt,lzcnt,abm,bmi,bmi2,fma")
/*
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;
- insert(x),erase(x)
- find_by_order(k): return iterator to the k-th smallest element
- order_of_key(x): the number of elements that are strictly smaller
*/
#include<bits/stdc++.h>
using namespace std;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
uniform_real_distribution<> pp(0.0,1.0);
#define ll long long
#define ld long double
#define pii pair<int,int>
#define piii pair<int,pii>
#define mpp make_pair
#define fi first
#define se second
const long long inf=1e18;
const int mod=998244353;
const int maxn=200005;
const int B=450;
const int maxs=655;
const int maxm=200005;
const int maxq=1000005;
const int maxl=25;
const int maxa=1000000;
const int root=3;
const int base=101;

int n,rr,q;
int c[maxn],L[maxn],R[maxn],T;
vector<int> edge[maxn];
vector<pii> qq[maxn];
vector<int> pos[maxn];
vector<int> res1[maxn],res2[maxn];
int num[maxn];

void dfs(int u){
    L[u]=++T;
    pos[c[u]].push_back(L[u]);
    for(int v:edge[u]) dfs(v);
    R[u]=T;
    qq[c[u]].push_back({L[u],R[u]});
    //cout << u << ' ' << c[u] << ' ' << L[u] << ' ' << R[u] << '\n';
}

void dfs2(int u,int C,int d){
    res1[C][c[u]]+=d;
    d+=(num[u]=(c[u]==C));
    for(int v:edge[u]){
        dfs2(v,C,d);
        num[u]+=num[v];
    }
    res2[C][c[u]]+=num[u];
}

void solve(){
    cin >> n >> rr >> q;
    for(int i=1;i<=n;i++){
        if(i>1){
            int p;cin >> p;
            edge[p].push_back(i);
        }
        cin >> c[i];
    }
    dfs(1);
    for(int i=1;i<=rr;i++){
        if((int)pos[i].size()>B){
            res1[i].assign(rr+1,0);
            res2[i].assign(rr+1,0);
            dfs2(1,i,0);
        }
    }
    for(int i=1;i<=q;i++){
        int x,y;cin >> x >> y;
        if((int)pos[x].size()>B) cout << res1[x][y] << endl;
        else if((int)pos[y].size()>B) cout << res2[y][x] << endl;
        else{
            int total=0,j=0;
            vector<pii> cc;
            //cout << '*' << x << '\n';
            for(auto [l,r]:qq[x]){
                //cout << l << ' ' << r << '\n';
                while(j<(int)pos[y].size() && pos[y][j]<=r) cc.push_back({pos[y][j++],1});
                while((int)cc.size()>=2 && cc.end()[-2].fi>=l){
                    int x=cc.back().se;cc.pop_back();
                    cc.back().se+=x;
                }
                if(!cc.empty() && cc.back().fi>=l) total+=cc.back().se;
            }
            cout << total << endl;
        }
    }
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);cout.tie(NULL);
    int test=1;//cin >> test;
    while(test--) solve();
}

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 24408 KB Output is correct
2 Correct 10 ms 24420 KB Output is correct
3 Correct 7 ms 24920 KB Output is correct
4 Correct 9 ms 25172 KB Output is correct
5 Correct 15 ms 23896 KB Output is correct
6 Correct 21 ms 23896 KB Output is correct
7 Correct 26 ms 23892 KB Output is correct
8 Correct 31 ms 23896 KB Output is correct
9 Correct 43 ms 24408 KB Output is correct
10 Correct 55 ms 24384 KB Output is correct
11 Correct 70 ms 25176 KB Output is correct
12 Correct 86 ms 26456 KB Output is correct
13 Correct 95 ms 26200 KB Output is correct
14 Correct 137 ms 26812 KB Output is correct
15 Correct 154 ms 29988 KB Output is correct

Subtask #2
85.0 / 85.0

# 결과 실행 시간 메모리 Grader output
1 Correct 566 ms 30504 KB Output is correct
2 Correct 705 ms 29028 KB Output is correct
3 Correct 1091 ms 32960 KB Output is correct
4 Correct 161 ms 26712 KB Output is correct
5 Correct 206 ms 28684 KB Output is correct
6 Correct 402 ms 31444 KB Output is correct
7 Correct 744 ms 30788 KB Output is correct
8 Correct 602 ms 43968 KB Output is correct
9 Correct 1174 ms 35264 KB Output is correct
10 Correct 1633 ms 53036 KB Output is correct
11 Correct 1853 ms 35200 KB Output is correct
12 Correct 654 ms 36872 KB Output is correct
13 Correct 965 ms 37344 KB Output is correct
14 Correct 1174 ms 39956 KB Output is correct
15 Correct 1535 ms 43088 KB Output is correct
16 Correct 1557 ms 52088 KB Output is correct
17 Correct 1601 ms 53616 KB Output is correct