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Submission #1098201

# Submission time Handle Problem Language Result Execution time Memory
1098201 2024-10-09T06:15:57 Z LilPluton Power Plant (JOI20_power) C++14
0 / 100
 15 ms 31580 KB 
#include <bits/stdc++.h>
using namespace std;
const int sz = 1e6 + 5;
#define int long long
int dx[] = {0, 0, 1, -1};
int dy[] = {1, -1, 0, 0};

struct DSU{

    vector<int>e;
    DSU(int n){
        e.assign(n + 1, -1);
    }
    int _find(int v){
        if(e[v] < 0){
            return v;
        }
        return e[v] = _find(e[v]);
    }
    int _union(int u,int v){
        u = _find(u);
        v = _find(v);
        if(u != v){
            if(e[u] > e[v]){
                swap(u, v);
            }
            e[u] += e[v];
            e[v] = u;
            return 1;
        }
        return 0;
    }

};
string s;
int n, res, sum, mx;
vector<vector<int>>v(sz);
vector<int>dp(sz);
void dfs(int u,int p){
    sum = 0;
    mx = 0;
    for(auto i : v[u]){
        if(i == p){
            continue;
        }
        dfs(i, u);
        sum += dp[i];
        mx = max(mx, dp[i]);
    }
    dp[u] = max((int)(s[u] == '1'), sum - (s[u] == '1'));
    res = max(res, sum - (int)(s[u] == '1'));
    res = max(res, mx + (int)(s[u] == '1'));   
}

void test_case(int testcase){
    cin >> n;
    for(int i = 0; i < n - 1; ++i){
        int a, b;
        cin >> a >> b;
        v[a].push_back(b);
        v[b].push_back(a);
    }
    cin >> s;
    s = '#' + s;
    dfs(1, -1);
    cout << res << endl;

}

signed main(){
    int T = 1;
    for(int test = 1; test <= T; ++test){
        test_case(test);
    } 
}

Subtask #1
0.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 31580 KB Output is correct
2 Correct 14 ms 31580 KB Output is correct
3 Incorrect 15 ms 31580 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0.0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 31580 KB Output is correct
2 Correct 14 ms 31580 KB Output is correct
3 Incorrect 15 ms 31580 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0.0 / 53.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 31580 KB Output is correct
2 Correct 14 ms 31580 KB Output is correct
3 Incorrect 15 ms 31580 KB Output isn't correct
4 Halted 0 ms 0 KB -