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Submission #428156

# Submission time Handle Problem Language Result Execution time Memory
428156 2021-06-15T08:30:23 Z cfalas Power Plant (JOI20_power) C++14
0 / 100
 1 ms 204 KB 
#include<bits/stdc++.h>
using namespace std;
#define mp make_pair
#define INF 10000000
#define MOD 1000000007
#define MID ((l+r)/2)
#define HASHMOD 2305843009213693951
#define ll long long
#define ull unsigned long long
#define F first
#define S second
typedef pair<ll, ll> ii;
typedef pair<ii, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef map<int, int> mii;

#define EPS 1e-6
#define FOR(i,n) for(int i=0;i<((int)(n));i++)
#define FORi(i,a,b) for(int i=((int)(a));i<((int)(b));i++)
#define FOA(v, a) for(auto v : a)

int t, n;
vi a, b;

vector<vi> adj;
int ans=0;
string x;

int cnt[300000];
int dfsc(int s, int p=-1){
	cnt[s] = (x[s-1]=='1');
	FOA(v,adj[s]) if(v!=p) cnt[s] += dfsc(v,s);
	return cnt[s];
}

int dp[300000];

int dfs(int s, bool prev, int p=-1){
	if(prev){
		int ans1 = 0;
		// don't take
		FOA(v, adj[s]) if(v!=p) ans1 = max(ans1, dfs(v, 1, s));
		//take
		if(x[s-1]=='1') ans1 = max(ans1, 1);
		//cout<<s<<" "<<prev<<" "<<ans1<<endl;
		return ans1;
	}
	else{
		if(dp[s]!=-1) return dp[s];
		int ans2=0;
		vi b;
		//ans2 = max(ans2, min(2, cnt[s]));
		if(x[s-1]=='1') ans2 = 1;
		int ans3 = 0;
		if(x[s-1]=='1') ans3--;
		FOA(v, adj[s]){
			if(v==p) continue;
			//cout<<s<<" going to "<<v<<endl;
			ans3 += dfs(v,0,s);
			if(p==-1) ans2 = max(ans2, (x[s-1]=='1' ? 1 : 0) + dfs(v,0,s));
		}
		ans2 = max(ans2, ans3);
		//cout<<s<<" "<<prev<<" "<<ans2<<" "<<ans3<<endl;
		dp[s] = ans2;
		return ans2;
	}
}

int main(){
	cin>>n;
	adj.assign(n+1, vi());
	FOR(i,n+1) dp[i] = -1;
	FOR(i,n-1){
		int a, b;
		cin>>a>>b;
		adj[a].push_back(b);
		adj[b].push_back(a);
	}
	cin>>x;
	dfsc(1);
	cout<<max(min(2, cnt[1]), max(dfs(1,0), dfs(1,1)))<<endl;

}

Subtask #1
0.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Incorrect 1 ms 204 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 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Incorrect 1 ms 204 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 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Incorrect 1 ms 204 KB Output isn't correct
8 Halted 0 ms 0 KB -