Submission #800777

#	Time	Username	Problem	Language	Result	Execution time	Memory
800777		nnhzzz	Ball Machine (BOI13_ballmachine)	C++14	100 / 100	156 ms	35620 KiB

ballmachine

// cre: Nguyen Ngoc Hung - Train VOI 2024 :>

#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <unordered_set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>
#include <cstring>
#include <unordered_map>
#include <cmath>
#include <array>
#include <cassert>
#include <random>

using namespace std;

#define    SORT_UNIQUE(v)  sort(ALL(v)),(v).resize(unique(ALL(v))-(v).begin())
#define        __nnhzzz__  signed main()
#define          BIT(i,j)  ((i>>j)&1LL)
#define           MASK(i)  (1LL<<i)
#define           RALL(x)  (x).rbegin(),(x).rend()
#define            ALL(x)  (x).begin(),(x).end()
#define             SZ(x)  (int)(x).size()
#define                fi  first
#define                se  second
#define               INF  0x3f3f3f3f
#define                ll  long long
#define               ull  unsigned long long
#define                ld  long double
#define                vi  vector<int>
#define               vvi  vector<vi>
#define              vvvi  vector<vvi>
#define             vvvvi  vector<vvvi>
#define               pii  pair<int,int>
#define              vpii  vector<pii>
#define      RESET(x,val)  memset((x),(val),sizeof(x))
#define REPDIS(i,be,en,j)  for(int i = (be); i<=(en); i+=j)
#define     REPD(i,be,en)  for(int i = (be); i>=(en); i--)
#define      REP(i,be,en)  for(int i = (be); i<=(en); i++)
//-------------------------------------------------------------//
const int oo = 1e9,LOG = 17,MAXN = 1e5+7,N = 1e2+3;
const int MOD = 1e9+7,MOD1 = 1e9+207,MOD2 = 1e9+407,MOD3 = 998244353;
//-------------------------------------------------------------//
template<typename T1, typename T2> bool mini(T1 &a, T2 b){if(a>b){a=b;return true;}return false;}
template<typename T1, typename T2> bool maxi(T1 &a, T2 b){if(a<b){a=b;return true;}return false;}
template<typename T> T gcd(T a, T b) { while(b) { a %= b; swap(a,b); } return a; }
template<typename T> T lcm(T a, T b) { return a/gcd(a,b)*b; }

/*
----------------------------------------------------------------
    END OF TEMPLATE
----------------------------------------------------------------
    Nguyen Ngoc Hung - nnhzzz
    Training for VOI24 gold medal
----------------------------------------------------------------
*/

int f[MAXN][LOG],pos[MAXN],ok[MAXN];
vi adj[MAXN][2];
int root,times = 0;

int dfs1(int u, int par){
    priority_queue<pii,vpii,greater<pii>> heap;
    for(auto v:adj[u][0]){
        if(v==par){
            continue;
        }
        heap.emplace(dfs1(v,u),v);
    }
    int res = u;
    while(SZ(heap)!=0){
        auto [mi,v] = heap.top(); heap.pop();
        adj[u][1].push_back(v);
        // cerr << u << " " << v << "\n";
        mini(res,mi);
    }
    // cerr << res << " ";
    return res;
}

priority_queue<pii,vpii,greater<pii>> heap;

void dfs2(int u){
    REP(i,1,LOG-1){
        f[u][i] = f[f[u][i-1]][i-1];
    }
    for(auto v:adj[u][1]){
        dfs2(v);
    }
    pos[u] = ++times;
    heap.emplace(pos[u],u);
}

void solve(){
    int n,q; cin >> n >> q;
    REP(u,1,n){
        int v; cin >> v;
        f[u][0] = v;
        if(v==0){
            root = u;
            continue;
        }
        adj[u][0].push_back(v);
        adj[v][0].push_back(u);
    }
    dfs1(root,0); dfs2(root);
    while(q--){
        int res = 0,t,u; cin >> t >> u;
        if(t==1){
            while(u--){
                auto [mi,v] = heap.top(); heap.pop();
                ok[v] = 1; res = v;
            }
        }else{
            REPD(i,LOG-1,0){
                if(ok[f[u][i]]==1){
                    res += MASK(i);
                    u = f[u][i];
                }
            }
            ok[u] = 0;
            heap.emplace(pos[u],u);
        }
        cout << res << "\n";
    }
}

__nnhzzz__{
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    #define name "test"
    if(fopen(name".inp","r")){
        freopen(name".inp","r",stdin);
        freopen(name".out","w",stdout);
    }
    #define name1 "nnhzzz"
    if(fopen(name1".inp","r")){
        freopen(name1".inp","r",stdin);
        freopen(name1".out","w",stdout);
    }

    int test = 1;

    while(test--){
      solve();
    }
    cerr << "\nTime elapsed: " << 1000*clock()/CLOCKS_PER_SEC << "ms\n";
    return 0;
}

Compilation message (stderr)

ballmachine.cpp: In function 'int dfs1(int, int)':
ballmachine.cpp:100:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  100 |         auto [mi,v] = heap.top(); heap.pop();
      |              ^
ballmachine.cpp: In function 'void solve()':
ballmachine.cpp:139:22: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  139 |                 auto [mi,v] = heap.top(); heap.pop();
      |                      ^
ballmachine.cpp: In function 'int main()':
ballmachine.cpp:161:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  161 |         freopen(name".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
ballmachine.cpp:162:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  162 |         freopen(name".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
ballmachine.cpp:166:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  166 |         freopen(name1".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
ballmachine.cpp:167:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  167 |         freopen(name1".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 25 / 25
• Subtask 2: 30 / 30
• Subtask 3: 40 / 40
• Subtask 4: 5 / 5