oj.uz

Submission #679220

# Submission time Handle Problem Language Result Execution time Memory
679220 2023-01-07T18:45:21 Z ziduo Mag (COCI16_mag) C++14
96 / 120
 433 ms 223364 KB 
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define f first
#define s second
int vals[1000000];
int dp[1000000][2];
vector<int> edges[1000000];
pair<int, int> answer;
void rec(int u, int p){
    for(int v: edges[u])if(v!=p)rec(v, u);
    if(vals[u]>2){
        dp[u][0] = 0;
        dp[u][1] = 0;
        return;
    }
    vector<int> use0;
    vector<int> use1;
    for(int v: edges[u])if(v!=p){
        use0.push_back(dp[v][0]);
        use1.push_back(dp[v][1]);
    }
    sort(use0.begin(), use0.end());
    sort(use1.begin(), use1.end());
    reverse(use0.begin(), use0.end());
    reverse(use1.begin(), use1.end());
    if(vals[u]==2){
        dp[u][0] = 0;
        if(use0.size()==0){
            dp[u][1] = 1;
            answer.s=max(answer.s, 1);
        }
        else{ 
            dp[u][1] = use0[0]+1;
            if(use0.size()==1)
                answer.s=max(answer.s,use0[0]+1);
            else
                answer.s=max(answer.s,use0[0]+1+use0[1]);
        }
    }
    else{
        if(use0.size()==0){
            dp[u][0] = 1;
            dp[u][1] = 0;
            answer.f=max(answer.f, 1);
        }
        else if(use0.size()==1){
            dp[u][0] = use0[0]+1;
            dp[u][1] = use1[0]+1;
            answer.f=max(answer.f, dp[u][0]);
            answer.s=max(answer.s, dp[u][1]);
        }
        else{
            dp[u][0] = use0[0]+1;
            dp[u][1] = use1[0]+1;
            answer.f=max(answer.f, use0[0]+use0[1]+1);
            answer.s=max(answer.s, use0[0]+use1[0]+1);
        }
    }
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n;
    cin>>n;
    for(int i=0; i<n; i++)edges[i] = {};
    for(int i=0; i<n-1; i++){
        int u, v;cin>>u>>v;u--;v--;
        edges[u].push_back(v);
        edges[v].push_back(u);
    }
    answer.f=0; answer.s=0;
    for(int i=0; i<n; i++)cin>>vals[i];
    rec(0, -1);
    if(answer.f==0&&answer.s==0){
        int prin = vals[0];
        for(int i=1; i<n; i++)prin = min(prin, vals[i]);
        cout<<prin<<"/1\n";
    }
    else{
        if(answer.f>answer.s/2)
            cout<<"1/"<<answer.f<<'\n';
        else{
            if((answer.s%2)==0)cout<<"1/"<<(answer.s/2)<<'\n';
            else cout<<"2/"<<answer.s<<'\n';
        }
        
    }
    return 0;
}

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23860 KB Output is correct
2 Correct 13 ms 23756 KB Output is correct

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 11 ms 23764 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 328 ms 120864 KB Output is correct

Subtask #4
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 23764 KB Output is correct
2 Correct 426 ms 221624 KB Output is correct

Subtask #5
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 414 ms 218472 KB Output is correct

Subtask #6
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 340 ms 66636 KB Output is correct
2 Correct 253 ms 55624 KB Output is correct

Subtask #7
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 350 ms 72432 KB Output is correct
2 Correct 56 ms 28212 KB Output is correct
3 Correct 433 ms 223364 KB Output is correct

Subtask #8
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 62 ms 28124 KB Output is correct
2 Correct 344 ms 67892 KB Output is correct
3 Correct 276 ms 45856 KB Output is correct

Subtask #9
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 312 ms 66780 KB Output is correct
2 Correct 351 ms 66144 KB Output is correct

Subtask #10
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 391 ms 67736 KB Output isn't correct
2 Halted 0 ms 0 KB -