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Submission #96971

# Submission time Handle Problem Language Result Execution time Memory
96971 2019-02-13T03:09:36 Z tieunhi Zagrade (COI17_zagrade) C++14
100 / 100
 1942 ms 41080 KB 
#include <bits/stdc++.h>
#define FOR(i, u, v) for (int i = u; i <= v; i++)
#define FORD(i, v, u) for (int i = v; i >= u; i--)
#define ll long long
#define pii pair<int, int>
#define PB push_back
#define mp make_pair
#define F first
#define S second
#define N 300005
#define BASE 37
#define mod 1000000007
#define mid (r + l)/2

using namespace std;

int n, spe[N], sz[N], dd[N], cnt[N], val[N];
long long res = 0;
vector<int> a[N];

void dfsCentroid(int u)
{
    spe[u] = 0; sz[u] = 1;
    dd[u] = 1;
    for (auto v : a[u])
    {
        if (dd[v]) continue;
        dfsCentroid(v);
        if (sz[v] > sz[spe[u]]) spe[u] = v;
        sz[u] += sz[v];
    }
    dd[u] = 0;
}
int centroid(int u)
{
    int siz = sz[u]/2;
    while (sz[spe[u]] > siz)
        u = spe[u];
    return u;
}
void DFS1(int u, int curVal, int maxVal)
{
    dd[u] = 1;
    if (curVal >= 0 && curVal == maxVal) res += cnt[maxVal];
    for (auto v : a[u])
    {
        if (dd[v]) continue;
        DFS1(v, curVal - val[v], max(maxVal, curVal - val[v]));
    }
    dd[u] = 0;
}
void DFS2(int u, int curVal, int maxVal)
{
    dd[u] = 1;
    if (curVal == maxVal) cnt[curVal]++;
    for (auto v : a[u])
    {
        if (dd[v]) continue;
        DFS2(v, curVal + val[v], max(maxVal, curVal + val[v]));
    }
    dd[u] = 0;
}
void solve(int u)
{
    dfsCentroid(u);
    int siz = sz[u];
    u = centroid(u);
    dd[u] = 1;

    FOR(i, 0, siz) cnt[i] = 0;
    if (val[u] == 1) cnt[1]++;
    for (auto v : a[u])
    {
        if (dd[v]) continue;
        DFS1(v, -val[v], max(0, -val[v]));
        DFS2(v, val[u] + val[v], max({0, val[u], val[u]+val[v]}));
    }
    for (auto v : a[u])
        if (!dd[v]) solve(v);
}
int main()
{
    ios_base::sync_with_stdio(0); cout.tie(0);
    //freopen("INP.TXT", "r", stdin);
    //freopen("OUT.TXT", "w", stdout);
    cin >> n;
    FOR(i, 1, n)
    {
        char c; cin >> c;
        val[i] = (c == '(') ? 1 : -1;
    }
    FOR(i, 2, n)
    {
        int u, v; cin >> u >> v;
        a[u].PB(v);
        a[v].PB(u);
    }
    solve(1);
    FOR(i, 1, n) dd[i] = 0, val[i] = -val[i];
    solve(1);
    cout <<res;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 7424 KB Output is correct
2 Correct 10 ms 7524 KB Output is correct
3 Correct 10 ms 7424 KB Output is correct
4 Correct 11 ms 7552 KB Output is correct
5 Correct 10 ms 7424 KB Output is correct
6 Correct 11 ms 7424 KB Output is correct
7 Correct 9 ms 7424 KB Output is correct
8 Correct 13 ms 7552 KB Output is correct
9 Correct 9 ms 7424 KB Output is correct
10 Correct 12 ms 7424 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 504 ms 40984 KB Output is correct
2 Correct 570 ms 41080 KB Output is correct
3 Correct 587 ms 40936 KB Output is correct
4 Correct 595 ms 40972 KB Output is correct
5 Correct 534 ms 40972 KB Output is correct
6 Correct 585 ms 40992 KB Output is correct
7 Correct 541 ms 40984 KB Output is correct
8 Correct 535 ms 40964 KB Output is correct
9 Correct 544 ms 40932 KB Output is correct
10 Correct 470 ms 40876 KB Output is correct
11 Correct 515 ms 40988 KB Output is correct

Subtask #3
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 7424 KB Output is correct
2 Correct 10 ms 7524 KB Output is correct
3 Correct 10 ms 7424 KB Output is correct
4 Correct 11 ms 7552 KB Output is correct
5 Correct 10 ms 7424 KB Output is correct
6 Correct 11 ms 7424 KB Output is correct
7 Correct 9 ms 7424 KB Output is correct
8 Correct 13 ms 7552 KB Output is correct
9 Correct 9 ms 7424 KB Output is correct
10 Correct 12 ms 7424 KB Output is correct
11 Correct 504 ms 40984 KB Output is correct
12 Correct 570 ms 41080 KB Output is correct
13 Correct 587 ms 40936 KB Output is correct
14 Correct 595 ms 40972 KB Output is correct
15 Correct 534 ms 40972 KB Output is correct
16 Correct 585 ms 40992 KB Output is correct
17 Correct 541 ms 40984 KB Output is correct
18 Correct 535 ms 40964 KB Output is correct
19 Correct 544 ms 40932 KB Output is correct
20 Correct 470 ms 40876 KB Output is correct
21 Correct 515 ms 40988 KB Output is correct
22 Correct 1759 ms 27100 KB Output is correct
23 Correct 1713 ms 27068 KB Output is correct
24 Correct 1942 ms 27092 KB Output is correct
25 Correct 1913 ms 27084 KB Output is correct
26 Correct 658 ms 31740 KB Output is correct
27 Correct 780 ms 29500 KB Output is correct
28 Correct 762 ms 28720 KB Output is correct
29 Correct 552 ms 40980 KB Output is correct
30 Correct 511 ms 40988 KB Output is correct
31 Correct 131 ms 26728 KB Output is correct
32 Correct 519 ms 41008 KB Output is correct