oj.uz

Submission #545329

# Submission time Handle Problem Language Result Execution time Memory
545329 2022-04-04T09:21:15 Z socpite Zagrade (COI17_zagrade) C++17
100 / 100
 982 ms 127520 KB 
#include<bits/stdc++.h>
using namespace std;

#define f first
#define s second

typedef long long ll;
typedef pair<int, int> pii;

const int maxn = 3e5+5;

vector<pii> up[maxn];
vector<pii> down[maxn];
vector<int> tree[maxn];
int A[maxn];
int sum[maxn], subsz[maxn], col[maxn], vis[maxn], mx[maxn];
vector<int> csum[maxn];

int n;

void predfs(int x, int p){
    subsz[x]=1;
    for(auto v: tree[x]){
        if(v == p || vis[v])continue;
        predfs(v, x);
        subsz[x]+=subsz[v];
    }
}

int gtcen(int x, int p, int tot){
    int re = 0;
    mx[x]=0;
    for(auto v: tree[x]){
        if(v == p || vis[v])continue;
        int tmp = gtcen(v, x, tot);
        if(mx[tmp] < mx[re])re = tmp;
        mx[x] = max(mx[x], subsz[v]);
    }
    mx[x]=max(mx[x], tot-subsz[x]);
    if(mx[x] < mx[re])re=x;
    return re;
}

void dfs(int x, int p, int ss, int mn, int mn2, int color, int rr){
    //cout << x << " " << ss << endl;
    if(mn2 >= 0){
        up[ss+A[rr]].push_back({color, rr});
        //cout << "up " << ss+A[rr] << " " << x << " " << rr << endl;
    }
    if(ss == mn && ss <= 0){
        down[-ss].push_back({color, rr});
        //cout << "down " << -ss << " " << x << " " << rr << endl;
    }
    for(auto v: tree[x]){
        if(v == p || vis[v])continue;
        dfs(v, x, ss+A[v], min(ss+A[v], mn), min(0, mn2 + A[v]), color, rr);
    }
}

int build(int x){
    predfs(x, 0);
    x = gtcen(x, 0, subsz[x]);
    vis[x]=1;
    int cc = 0;
    if(A[x] > 0)up[1].push_back({-1, x});
    down[0].push_back({-1, x});
    for(auto v: tree[x]){
        if(vis[v])continue;
        dfs(v, x, A[v], min(0, A[v]), min({0, A[v], A[v]+A[x]}), cc++, x);
    }
    csum[x].assign(cc, 0);
    for(auto v: tree[x]){
        if(!vis[v]){
            int tmp = build(v);
            //cout << x << " " << tmp << endl;
        }
    }
    return x;
}

int main(){
    ll ans = 0;
    cin >> n;
    mx[0]=n;
    for(int i = 1; i <= n; i++){
        char c;
        cin >> c;
        if(c == '(')A[i]=1;
        else A[i]=-1;
    }
    for(int i = 1; i < n; i++){
        int a, b;
        cin >> a >> b;
        tree[a].push_back(b);
        tree[b].push_back(a);
    }
    build(1);
    for(int i = 0; i <= n; i++){
        for(auto v: down[i]){
            sum[v.s]++;
            if(v.f >= 0)csum[v.s][v.f]++;
        }
        for(auto v: up[i]){
            ans += sum[v.s];
            if(v.f >= 0)ans-=csum[v.s][v.f];
        }
        for(auto v: down[i]){
            sum[v.s] = 0;
            if(v.f >= 0)csum[v.s][v.f]=0;
        }
    }
    cout << ans;
}

Compilation message

zagrade.cpp: In function 'int build(int)':
zagrade.cpp:74:17: warning: unused variable 'tmp' [-Wunused-variable]
   74 |             int tmp = build(v);
      |                 ^~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 28628 KB Output is correct
2 Correct 14 ms 28628 KB Output is correct
3 Correct 15 ms 28656 KB Output is correct
4 Correct 18 ms 28628 KB Output is correct
5 Correct 19 ms 28600 KB Output is correct
6 Correct 15 ms 28652 KB Output is correct
7 Correct 16 ms 28616 KB Output is correct
8 Correct 15 ms 28520 KB Output is correct
9 Correct 19 ms 28552 KB Output is correct
10 Correct 16 ms 28564 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 497 ms 91888 KB Output is correct
2 Correct 613 ms 112288 KB Output is correct
3 Correct 562 ms 92308 KB Output is correct
4 Correct 567 ms 107084 KB Output is correct
5 Correct 535 ms 92484 KB Output is correct
6 Correct 554 ms 98716 KB Output is correct
7 Correct 475 ms 92064 KB Output is correct
8 Correct 545 ms 98728 KB Output is correct
9 Correct 483 ms 91932 KB Output is correct
10 Correct 583 ms 127288 KB Output is correct
11 Correct 596 ms 119032 KB Output is correct

Subtask #3
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 28628 KB Output is correct
2 Correct 14 ms 28628 KB Output is correct
3 Correct 15 ms 28656 KB Output is correct
4 Correct 18 ms 28628 KB Output is correct
5 Correct 19 ms 28600 KB Output is correct
6 Correct 15 ms 28652 KB Output is correct
7 Correct 16 ms 28616 KB Output is correct
8 Correct 15 ms 28520 KB Output is correct
9 Correct 19 ms 28552 KB Output is correct
10 Correct 16 ms 28564 KB Output is correct
11 Correct 497 ms 91888 KB Output is correct
12 Correct 613 ms 112288 KB Output is correct
13 Correct 562 ms 92308 KB Output is correct
14 Correct 567 ms 107084 KB Output is correct
15 Correct 535 ms 92484 KB Output is correct
16 Correct 554 ms 98716 KB Output is correct
17 Correct 475 ms 92064 KB Output is correct
18 Correct 545 ms 98728 KB Output is correct
19 Correct 483 ms 91932 KB Output is correct
20 Correct 583 ms 127288 KB Output is correct
21 Correct 596 ms 119032 KB Output is correct
22 Correct 982 ms 66472 KB Output is correct
23 Correct 913 ms 67404 KB Output is correct
24 Correct 915 ms 67468 KB Output is correct
25 Correct 966 ms 68472 KB Output is correct
26 Correct 542 ms 72960 KB Output is correct
27 Correct 560 ms 69488 KB Output is correct
28 Correct 554 ms 67572 KB Output is correct
29 Correct 608 ms 127520 KB Output is correct
30 Correct 583 ms 127048 KB Output is correct
31 Correct 201 ms 55544 KB Output is correct
32 Correct 580 ms 118940 KB Output is correct