Submission #480291

#	Time	Username	Problem	Language	Result	Execution time	Memory
480291		MOUF_MAHMALAT	Zagrade (COI17_zagrade)	C++14	10 / 100	8 ms	7372 KiB

zagrade

#include<bits/stdc++.h>
#define all(s) s.begin(),s.end()
#define F first
#define S second
using namespace std;
typedef int ll;
ll n,x,y,b[1009],ans;
char c;
vector<vector<ll> >v;
void dfs(ll d,ll p,ll sum)
{
    if(sum<0)
        return;
    if(sum==0)
        ans++;
    for(auto z:v[d])
        if(z!=p)
            dfs(z,d,sum+b[z]);
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0),cout.tie(0);
    cin>>n;
    v.resize(n+1);
    for(ll i=1; i<=n; i++)
    {
        cin>>c;
        if(c=='(')
            b[i]=1;
        else
            b[i]=-1;
    }
    for(ll i=1; i<n; i++)
    {
        cin>>x>>y;
        v[x].push_back(y);
        v[y].push_back(x);
    }
    for(ll i=1;i<=n;i++)
        dfs(i,i,b[i]);
    cout<<ans;
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 30
• Subtask 3: 0 / 60