oj.uz

Submission #675196

# Submission time Handle Problem Language Result Execution time Memory
675196 2022-12-27T02:49:56 Z abcvuitunggio Uzastopni (COCI15_uzastopni) C++17
160 / 160
 86 ms 17884 KB 
#include <iostream>
#include <bitset>
#include <vector>
#include <algorithm>
#include <cstdio>
using namespace std;
bitset <101> dp[10001][101];
int n,a[10001],u,v,res;
vector <int> ke[10001];
void dfs(int u){
    dp[u][a[u]][a[u]]=1;
    if (ke[u].empty())
        return;
    int pos=-1,pos2=1e9;
    for (int i=0;i<ke[u].size();i++){
        int v=ke[u][i];
        dfs(v);
        if (a[v]<=a[u])
            pos=max(pos,i);
        if (a[v]>=a[u])
            pos2=min(pos2,i);
    }
    for (int it=pos2;it<ke[u].size();it++){
        int v=ke[u][it];
        for (int j=a[u];j<=100;j++)
            if (!dp[u][a[u]][j])
                for (int i=a[u]+1;i<=j;i++)
                    dp[u][a[u]][j]=dp[u][a[u]][j]|(dp[u][a[u]][i-1]&dp[v][i][j]);
    }
    for (int it=pos;it>=0;it--){
        int v=ke[u][it];
        for (int j=1;j<=a[u];j++)
            if (!dp[u][j][a[u]])
                for (int i=j;i<a[u];i++)
                    dp[u][j][a[u]]=dp[u][j][a[u]]|(dp[u][i+1][a[u]]&dp[v][j][i]);
    }
    for (int i=1;i<=a[u];i++)
        for (int j=a[u];j<=100;j++)
            dp[u][i][j]=dp[u][i][j]|(dp[u][i][a[u]]&dp[u][a[u]][j]);
}
int main(){
    ios_base::sync_with_stdio(NULL);cin.tie(nullptr);
    cin >> n;
    for (int i=1;i<=n;i++)
        cin >> a[i];
    for (int i=1;i<n;i++){
        cin >> u >> v;
        ke[u].push_back(v);
    }
    for (int i=1;i<=n;i++)
        if (!ke[i].empty())
            sort(ke[i].begin(),ke[i].end(),[](int i, int j){
                    return a[i]<a[j];
                 });
    dfs(1);
    int cnt=0;
    for (int i=1;i<=100;i++)
        for (int j=1;j<=100;j++)
            cnt+=dp[1][i][j];
    cout << cnt;
}

Compilation message

uzastopni.cpp: In function 'void dfs(int)':
uzastopni.cpp:15:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |     for (int i=0;i<ke[u].size();i++){
      |                  ~^~~~~~~~~~~~~
uzastopni.cpp:23:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |     for (int it=pos2;it<ke[u].size();it++){
      |                      ~~^~~~~~~~~~~~~

Subtask #1
160.0 / 160.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 596 KB Output is correct
2 Correct 1 ms 596 KB Output is correct
3 Correct 1 ms 596 KB Output is correct
4 Correct 1 ms 596 KB Output is correct
5 Correct 2 ms 724 KB Output is correct
6 Correct 1 ms 724 KB Output is correct
7 Correct 1 ms 724 KB Output is correct
8 Correct 1 ms 724 KB Output is correct
9 Correct 2 ms 724 KB Output is correct
10 Correct 1 ms 724 KB Output is correct
11 Correct 59 ms 16460 KB Output is correct
12 Correct 55 ms 16484 KB Output is correct
13 Correct 58 ms 16600 KB Output is correct
14 Correct 83 ms 17868 KB Output is correct
15 Correct 86 ms 17884 KB Output is correct
16 Correct 85 ms 17832 KB Output is correct
17 Correct 60 ms 16472 KB Output is correct
18 Correct 57 ms 16512 KB Output is correct
19 Correct 23 ms 16340 KB Output is correct
20 Correct 23 ms 16392 KB Output is correct