Submission #98751

#	Time	Username	Problem	Language	Result	Execution time	Memory
98751		luckyboy	Uzastopni (COCI15_uzastopni)	C++14	160 / 160	9 ms	1152 KiB

uzastopni

/**Lucky Boy**/
#include <bits/stdc++.h>
#define FOR(i, a, b) for (int i = (a); i <= (b); ++i)
#define FORD(i, a, b) for (int i = (a); i >= (b); --i)
#define pb push_back
#define mp make_pair
#define F first
#define S second
#define maxc 1000000007
#define maxn 10004
#define maxm 101
#define pii pair <int,int>
#define Task "UZASTOPNI"
template <typename T> inline void read(T &x){char c;bool nega=0;while((!isdigit(c=getchar()))&&(c!='-'));if(c=='-'){nega=1;c=getchar();}x=c-48;while(isdigit(c=getchar())) x=x*10+c-48;if(nega) x=-x;}
template <typename T> inline void writep(T x){if(x>9) writep(x/10);putchar(x%10+48);}
template <typename T> inline void write(T x){if(x<0){putchar('-');x=-x;}writep(x);putchar(' ');}
template <typename T> inline void writeln(T x){write(x);putchar('\n');}
using namespace std;
int n,val[maxn];
vector <int> a[maxn];
bitset <maxm> l[maxn],r[maxn];
bool dd[maxm];
bool comp(int x,int y)
{
    return val[x] < val[y];
}
void Dfs(int u)
{
    dd[val[u]] = 1;
    l[u].set(val[u],1);
    r[u].set(val[u],1);
    for (int v : a[u])
        if (!dd[val[v]])
        {
            Dfs(v);
        }
    for (int v : a[u])
    {
        if (dd[val[v]] || val[v] < val[u]) continue;
        FOR(i,val[u] + 1,val[v])
            if (r[u][i-1] && l[v][i])
            {
                r[u].set(val[v],1);
                break;
            }
        if (r[u][val[v] - 1])
        {
            r[u] |= r[v];
        }
    }
    reverse(a[u].begin(),a[u].end());
    for (int v : a[u])
    {
        if (dd[val[v]] || val[v] > val[u]) continue;
        FOR(i,val[v],val[u] - 1)
            if (r[v][i] && l[u][i+1])
            {
                l[u].set(val[v],1);
                break;
            }
        if (l[u][val[v] + 1])
        {
            l[u] |= l[v];
        }
    }
    dd[val[u]] = 0;
}
int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    //freopen(Task".inp", "r",stdin);
    //freopen(Task".out", "w",stdout);
    cin >> n;
    FOR(i,1,n) cin >> val[i];
    FOR(i,2,n)
    {
        int x,y;
        cin >> x >> y;
        a[x].pb(y);
    }
    FOR(i,1,n) sort(a[i].begin(),a[i].end(),comp);
    Dfs(1);
    int ll = l[1].count(),
        rr = r[1].count();
    cout << ll * rr;
    return 0;
}

• Subtask 1: 160 / 160