Submission #821378

#	Time	Username	Problem	Language	Result	Execution time	Memory
821378		stefanopulos	Zagrade (COI17_zagrade)	C++17	100 / 100	509 ms	45036 KiB

zagrade

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <bits/stdc++.h>
 
using namespace std;
using namespace __gnu_pbds;
 
typedef long long ll;
typedef long double ldb;
 
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef pair<ldb,ldb> pdd;
 
#define ff(i,a,b) for(int i = a; i <= b; i++)
#define fb(i,b,a) for(int i = b; i >= a; i--)
#define trav(a,x) for(auto& a : x)
 
#define sz(a) (int)(a).size()
#define fi first
#define se second
#define pb push_back
#define lb lower_bound
#define ub upper_bound
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
 
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
 
template<typename T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
 
// os.order_of_key(k) the number of elements in the os less than k
// *os.find_by_order(k)  print the k-th smallest number in os(0-based)
 
const int mod = 1000000007;
const int inf = 1e9 + 5;
const int mxN = 300005; 
 
int n;
string s;
 
vector<int> g[mxN];
 
int cnt[mxN];
bool bio[mxN];
void dfs_cnt(int v, int p){
    cnt[v] = 1;
    for(auto u : g[v]){
        if(u != p && !bio[u]){
            dfs_cnt(u, v);
            cnt[v] += cnt[u];
        }
    }
}
 
int centroid(int v, int p, int vel){
    for(auto u : g[v]){
        if(u == p || bio[u])continue;
        if(cnt[u] > vel / 2)return centroid(u, v, vel);
    }
    return v;
}
 
ll br = 0;
vector<int> cuvaj;
int kol[2 * mxN + 5];
 
int X = 0; bool f = 1;
void dfs(int v, int p, int sumA, int dlA, int grB){
    int Y = (s[v] == '(' ? 1 : -1);
    sumA += Y; dlA = min(dlA, sumA); grB = min(0, grB + Y);
 
    if(dlA >= sumA)br += kol[sumA + mxN];
 
    if(f == 1 && sumA + X == 0)br += (min(0, dlA + X) >= 0) + (grB >= 0);
 
    if(grB == 0)cuvaj.pb(-(sumA + X));
    for(auto u : g[v]){
        if(u != p && !bio[u]){
            dfs(u, v, sumA, dlA, grB);
        }
    }
 
 
}
 
 
void decompose(int v){
    dfs_cnt(v, -1); int cen = centroid(v, -1, cnt[v]);
    bio[cen] = 1; X = (s[cen] == '(' ? 1 : -1);
 
 
    vector<int> svi;
    ff(_,0,1){
        for(auto u : g[cen]){
            if(!bio[u]){
                dfs(u, cen, 0, 0, min(0, X));
                
                for(auto c : cuvaj){
                    kol[c + mxN] += 1;
                    svi.pb(c + mxN);
                }
                cuvaj.clear();
 
            }
        }
 
        for(auto c : svi)kol[c] = 0;
        svi.clear();
 
        reverse(all(g[cen])); f ^= 1;
 
    }
 
    for(auto u : g[cen]){
        if(!bio[u]){
            decompose(u);
        }
    }
 
 
}
 
int main(){
    cin.tie(0)->sync_with_stdio(0);
 
    cin >> n >> s; s = ' ' + s;
    ff(i,1,n - 1){
        int u, v;
        cin >> u >> v;
        g[u].pb(v);
        g[v].pb(u);
    }
 
    decompose(1);
 
    cout << br << '\n';
 
    return 0;
}
/*
 
 
 
// probati bojenje sahovski
*/
 
 
 
 
 

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