oj.uz

Submission #216788

# Submission time Handle Problem Language Result Execution time Memory
216788 2020-03-28T04:28:04 Z combi1k1 Sweeping (JOI20_sweeping) C++14
11 / 100
 18000 ms 186312 KB 
//this solution is referred from comment of 300iq:
//https://codeforces.com/blog/entry/74871?#comment-590823
#include<bits/stdc++.h>

using namespace std;

#define ll  long long
#define ld  double

#define sz(x)   (int)x.size()
#define all(x)  x.begin(),x.end()

#define pb  emplace_back
#define X   first
#define Y   second

const int   N   = 2e6 + 5;

typedef pair<int,int>   ii;
typedef pair<int,ii>    pii;

struct Node {
    Node *l, *r;
    Node *par;
    ii  key;
    int pri, nCh;
    int lzX, lzY;

    Node(int x = 0,int y = 0) : l(0), r(0), par(0), key(ii(x,y)), pri(rand() << 16 ^ rand()), nCh(1), lzX(-1), lzY(-1)  {}
}  *p[N];

int Siz(Node *x)    {
    if (x)  return  x -> nCh;
    else    return  0;
}

void app(Node *x,int a,int b)   {
    if (a >= 0) (x -> key).X = x -> lzX = a;
    if (b >= 0) (x -> key).Y = x -> lzY = b;
}
void pull(Node *x)  {
    x -> nCh = 1;
    x -> nCh += Siz(x -> l);
    x -> nCh += Siz(x -> r);

    if (x -> l) x -> l -> par = x;
    if (x -> r) x -> r -> par = x;
}
void push(Node *x)  {
    if (x -> l) app(x -> l,x -> lzX,x -> lzY);
    if (x -> r) app(x -> r,x -> lzX,x -> lzY);

    x -> lzX = -1;
    x -> lzY = -1;
}
Node *join(Node *x,Node *y) {
    if (!x) return  y;
    if (!y) return  x;

    if (x -> pri > y -> pri)    {
        push(x);    x -> r = join(x -> r,y);
        pull(x);    return  x;
    }
    else    {
        push(y);    y -> l = join(x,y -> l);
        pull(y);    return  y;
    }
}
void split(Node *x,Node*&l,Node*&r,ii  v)   {
    if (!x) {
        l = r = 0;
        return;
    }
    push(x);

    if (v.X < (x -> key).X) {   split(x -> l,l,x -> l,v);   pull(r = x);    return; }
    if (v.Y < (x -> key).Y) {   split(x -> l,l,x -> l,v);   pull(r = x);    return; }

    split(x -> r,x -> r,r,v);
    pull(l = x);
}

vector<Node*>   vec;

void dfs(Node *x)   {
    if(!x)  return;

    push(x);

    dfs(x -> l);    vec.pb(x);
    dfs(x -> r);
}

struct Group    {
    Node *Rt;
    int x, y;
};
bool operator < (const Group&a,const Group&b)   {
    ii  tmp1(-a.y,a.Rt -> pri);
    ii  tmp2(-b.y,b.Rt -> pri);

    return  tmp1 < tmp2;
}

priority_queue<Group>   pq[N];

int tr[N << 2];

#define lch     i << 1
#define rch     i << 1 | 1

void upd(int i,int l,int r,int p)   {
    if (l > p)  return;
    if (r < p)  return;
    if (l == r) {
        if (pq[l].size())   tr[i] = pq[l].top().y;
        else                tr[i] = 1e9 + 7;
        return;
    }
    int m = (l + r) / 2;

    upd(lch,l,m,p); ++m;
    upd(rch,m,r,p);

    tr[i] = min(tr[lch],tr[rch]);
}

int main()  {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    srand(time(NULL));

    int n;  cin >> n;
    int m;  cin >> m;
    int q;  cin >> q;

    vector<pii> Que;
    vector<int> val;

    for(int i = 0 ; i < m ; ++i)    {
        int x;  cin >> x;
        int y;  cin >> y;

        Que.pb(4,ii(x,y));
        val.pb(x);
    }
    for(int i = 0 ; i < q ; ++i)    {
        int t;  cin >> t;
        int x;  cin >> x;
        int y = n - x;

        if (t == 4) cin >> y;
        if (t == 2) swap(x,y);

        Que.pb(t,ii(x,y));

        if (t != 1)
            val.pb(x);
    }
    sort(all(val));
    val.erase(unique(all(val)),val.end());

    auto add = [&](Node *R) {
        if(!R)  return;
        Group G;
        G.Rt = R;

        while (R -> l)
            push(R),
            R = R -> l;

        G.x = (R -> key).X;
        G.y = (R -> key).Y;

        int p = upper_bound(all(val),G.x) - val.begin();

        pq[p].push(G);

        if (pq[p].top().y == G.y)
            upd(1,1,sz(val),p);
    };

    fill(tr + 1,tr + 4 * sz(val),1e9 + 7);
    int tot = 0;

    for(pii T : Que)    {
        int t = T.X;
        int x = T.Y.X;
        int y = T.Y.Y;

        if (t == 1) {
            vector<Node*> Path;

            for(Node* a = p[x] ; a -> par ; Path.pb(a = a -> par)); reverse(all(Path));
            for(Node* a : Path) push(a);

            cout << (p[x] -> key).X << " ";
            cout << (p[x] -> key).Y << "\n";
            continue;
        }
        if (t == 4) {
            add(p[++tot] = new Node(x,y));
            continue;
        }
        vector<Node*> tmp;

        while (tr[1] <= y)  {
            int i = 1;
            int l = 1;
            int r = sz(val);

            while (l < r)   {
                int m = (l + r) / 2;

                if (tr[lch] <= y)   i = lch, r = m;
                else                i = rch, l = m + 1;
            }
            if (val[l - 1] > x)
                break;

            while (pq[l].size())    {
                if(pq[l].top().y > y)
                    break;

                Group G = pq[l].top();  pq[l].pop();

                Node *a;
                Node *b;

                split(G.Rt,a,b,ii(x,y));    add(b);

                if (a)  a -> par = 0;
                if (b)  b -> par = 0;

                assert(a);
                tmp.pb(a);
            }
            upd(1,1,sz(val),l);
        }
        sort(all(tmp),[&](Node *a,Node *b)  {
            return  Siz(a) > Siz(b);
        });

        for(Node *a : tmp)  {
            if (t == 2) app(a,x,-1);
            if (t == 3) app(a,-1,y);
        }
        Node *Rt = 0;

        for(Node *a : tmp)  {
            if (Siz(Rt) < Siz(a))
                swap(Rt,a);

            vec.clear();
            dfs(a);

            for(Node*&x : vec)  {
                Node *y;

                x -> l = 0;
                x -> r = 0;
                x -> par = 0;

                split(Rt,Rt,y,x -> key);

                Rt = join(Rt,x);
                Rt = join(Rt,y);
            }
        }
        add(Rt);
    }
}

Compilation message

sweeping.cpp: In function 'int main()':
sweeping.cpp:195:13: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
             for(Node* a = p[x] ; a -> par ; Path.pb(a = a -> par)); reverse(all(Path));
             ^~~
sweeping.cpp:195:69: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
             for(Node* a = p[x] ; a -> par ; Path.pb(a = a -> par)); reverse(all(Path));
                                                                     ^~~~~~~

Subtask #1
1.0 / 1.0

# Verdict Execution time Memory Grader output
1 Correct 49 ms 63480 KB Output is correct
2 Correct 45 ms 63224 KB Output is correct
3 Correct 45 ms 63608 KB Output is correct
4 Correct 49 ms 63488 KB Output is correct
5 Correct 50 ms 63480 KB Output is correct
6 Correct 52 ms 63352 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3094 ms 182368 KB Output is correct
2 Correct 3157 ms 182156 KB Output is correct
3 Correct 3302 ms 182172 KB Output is correct
4 Correct 2101 ms 181332 KB Output is correct
5 Correct 3702 ms 186312 KB Output is correct
6 Correct 3576 ms 182216 KB Output is correct
7 Correct 3049 ms 184404 KB Output is correct

Subtask #3
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 2176 ms 165684 KB Output is correct
2 Correct 2127 ms 166516 KB Output is correct
3 Correct 1326 ms 168688 KB Output is correct
4 Execution timed out 18090 ms 165756 KB Time limit exceeded
5 Halted 0 ms 0 KB -

Subtask #4
0 / 53.0

# Verdict Execution time Memory Grader output
1 Correct 2176 ms 165684 KB Output is correct
2 Correct 2127 ms 166516 KB Output is correct
3 Correct 1326 ms 168688 KB Output is correct
4 Execution timed out 18090 ms 165756 KB Time limit exceeded
5 Halted 0 ms 0 KB -

Subtask #5
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 49 ms 63480 KB Output is correct
2 Correct 45 ms 63224 KB Output is correct
3 Correct 45 ms 63608 KB Output is correct
4 Correct 49 ms 63488 KB Output is correct
5 Correct 50 ms 63480 KB Output is correct
6 Correct 52 ms 63352 KB Output is correct
7 Correct 3094 ms 182368 KB Output is correct
8 Correct 3157 ms 182156 KB Output is correct
9 Correct 3302 ms 182172 KB Output is correct
10 Correct 2101 ms 181332 KB Output is correct
11 Correct 3702 ms 186312 KB Output is correct
12 Correct 3576 ms 182216 KB Output is correct
13 Correct 3049 ms 184404 KB Output is correct
14 Correct 2176 ms 165684 KB Output is correct
15 Correct 2127 ms 166516 KB Output is correct
16 Correct 1326 ms 168688 KB Output is correct
17 Execution timed out 18090 ms 165756 KB Time limit exceeded
18 Halted 0 ms 0 KB -