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Submission #868648

# Submission time Handle Problem Language Result Execution time Memory
868648 2023-11-01T05:20:28 Z 12345678 Power Plant (JOI20_power) C++17
0 / 100
 1 ms 5036 KB 
#include <bits/stdc++.h>

using namespace std;

const int nx=2e5+5;
int n, u, v, dp1[nx], dp2[nx];
vector<int> d[nx];
string s;

void dfs(int u, int p)
{

    for (auto v:d[u])
    {
        if (v==p) continue;
        dfs(v, u);
        if (s[u-1]=='1') dp1[u]+=dp1[v], dp2[u]=max(dp2[u], dp1[v]+1);
        else dp1[u]+=max(dp1[v], dp2[v]-2), dp2[u]=max(dp2[u], dp2[v]);
    }
    if (s[u-1]=='1') dp1[u]=max(1, dp1[u]-1), dp2[u]=max(dp2[u], 1);
}

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n;
    for (int i=1; i<n; i++) cin>>u>>v, d[u].push_back(v), d[v].push_back(u);
    cin>>s;
    dfs(1, 1);
    cout<<max(dp1[1], dp2[1]);
}

Subtask #1
0.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4956 KB Output is correct
2 Correct 1 ms 5036 KB Output is correct
3 Correct 1 ms 4956 KB Output is correct
4 Correct 1 ms 4956 KB Output is correct
5 Correct 1 ms 4956 KB Output is correct
6 Correct 1 ms 4956 KB Output is correct
7 Incorrect 1 ms 4956 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #2
0.0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4956 KB Output is correct
2 Correct 1 ms 5036 KB Output is correct
3 Correct 1 ms 4956 KB Output is correct
4 Correct 1 ms 4956 KB Output is correct
5 Correct 1 ms 4956 KB Output is correct
6 Correct 1 ms 4956 KB Output is correct
7 Incorrect 1 ms 4956 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #3
0.0 / 53.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4956 KB Output is correct
2 Correct 1 ms 5036 KB Output is correct
3 Correct 1 ms 4956 KB Output is correct
4 Correct 1 ms 4956 KB Output is correct
5 Correct 1 ms 4956 KB Output is correct
6 Correct 1 ms 4956 KB Output is correct
7 Incorrect 1 ms 4956 KB Output isn't correct
8 Halted 0 ms 0 KB -