Submission #941251

#	Time	Username	Problem	Language	Result	Execution time	Memory
941251		WanWan	Beech Tree (IOI23_beechtree)	C++17	9 / 100	2031 ms	11264 KiB

beechtree

#include "beechtree.h"
#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
void debug_out() {cerr<<endl;}
template <typename Head, typename... Tail>
void debug_out(Head _H, Tail... _T) {cerr<<" "<<to_string(_H);debug_out(_T...);}
#define debug(...) cerr<<"["<<#__VA_ARGS__<<"]:",debug_out(__VA_ARGS__)
#else
#define debug(...)
#endif
const int MAXN = 2005;
const int inf=1000000500ll;
const long long oo =1000000000000000500ll;
const int MOD = (int)1e9+7;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
typedef pair<int,int> pi; 
int par[MAXN];
vector<int>childs[MAXN];
int st[MAXN],en[MAXN];
int TIME;
bool child(int par, int child){
    if(st[par]<=st[child] && en[par]>=en[child])return 1;
    return 0;
}
void dfs(int x, int p){
    st[x]=TIME++;
    par[x]=p;
    for(auto v:childs[x]){
        dfs(v,x);
    }
    en[x]=TIME-1;
}
std::vector<int> beechtree(int n, int M, std::vector<int> P, std::vector<int> C)
{
    vector<int> res=vector<int>(n,0);
    for(int i=1;i<n;i++){
        childs[P[i]].push_back(i);
    }
    dfs(0,-1);
    for(int i=0;i<n;i++){ // check for this guy
        vector<int>vec;
        for(int x=0;x<n;x++){
            if(child(i,x))vec.push_back(x);
        }
        debug(i,vec.size());
        sort(vec.begin(),vec.end());
        do {
            bool bad=0;
            unordered_map<int,int>cnt;
            for(int i=1;i<vec.size();i++){

                int to=cnt[C[vec[i]]];
                if(par[vec[i]] != vec[to]){
                    bad=1;
                }
                cnt[C[vec[i]]]++;
            }
            if(bad==0){
                res[i]=1;
            }
        } while(next_permutation(vec.begin(),vec.end()));

    }
    return res;
}

Compilation message (stderr)

beechtree.cpp: In function 'std::vector<int> beechtree(int, int, std::vector<int>, std::vector<int>)':
beechtree.cpp:51:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |             for(int i=1;i<vec.size();i++){
      |                         ~^~~~~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 9 / 9
• Subtask 2: 0 / 5
• Subtask 3: 0 / 9
• Subtask 4: 0 / 8
• Subtask 5: 0 / 14
• Subtask 6: 0 / 14
• Subtask 7: 0 / 12
• Subtask 8: 0 / 17
• Subtask 9: 0 / 12