oj.uz

Submission #216750

# Submission time Handle Problem Language Result Execution time Memory
216750 2020-03-28T02:59:37 Z combi1k1 Sweeping (JOI20_sweeping) C++14
11 / 100
 18000 ms 187256 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<ii>  vec;

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

    dfs(x -> l);    vec.pb(x -> key);
    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);
        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);
        }
        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(ii  e : vec)    {
                Node *x;
                Node *y;

                split(a,x,a,e);
                split(Rt,Rt,y,e);

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

Compilation message

sweeping.cpp: In function 'int main()':
sweeping.cpp:193:13: 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:193:69: 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 47 ms 63608 KB Output is correct
2 Correct 43 ms 63352 KB Output is correct
3 Correct 43 ms 63616 KB Output is correct
4 Correct 48 ms 63608 KB Output is correct
5 Correct 47 ms 63480 KB Output is correct
6 Correct 159 ms 63360 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3035 ms 184064 KB Output is correct
2 Correct 3030 ms 185796 KB Output is correct
3 Correct 3025 ms 185948 KB Output is correct
4 Correct 2063 ms 182056 KB Output is correct
5 Correct 3659 ms 187256 KB Output is correct
6 Correct 3484 ms 183076 KB Output is correct
7 Correct 3018 ms 185764 KB Output is correct

Subtask #3
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1994 ms 165652 KB Output is correct
2 Correct 1980 ms 167948 KB Output is correct
3 Correct 1355 ms 171756 KB Output is correct
4 Execution timed out 18062 ms 168184 KB Time limit exceeded
5 Halted 0 ms 0 KB -

Subtask #4
0 / 53.0

# Verdict Execution time Memory Grader output
1 Correct 1994 ms 165652 KB Output is correct
2 Correct 1980 ms 167948 KB Output is correct
3 Correct 1355 ms 171756 KB Output is correct
4 Execution timed out 18062 ms 168184 KB Time limit exceeded
5 Halted 0 ms 0 KB -

Subtask #5
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 47 ms 63608 KB Output is correct
2 Correct 43 ms 63352 KB Output is correct
3 Correct 43 ms 63616 KB Output is correct
4 Correct 48 ms 63608 KB Output is correct
5 Correct 47 ms 63480 KB Output is correct
6 Correct 159 ms 63360 KB Output is correct
7 Correct 3035 ms 184064 KB Output is correct
8 Correct 3030 ms 185796 KB Output is correct
9 Correct 3025 ms 185948 KB Output is correct
10 Correct 2063 ms 182056 KB Output is correct
11 Correct 3659 ms 187256 KB Output is correct
12 Correct 3484 ms 183076 KB Output is correct
13 Correct 3018 ms 185764 KB Output is correct
14 Correct 1994 ms 165652 KB Output is correct
15 Correct 1980 ms 167948 KB Output is correct
16 Correct 1355 ms 171756 KB Output is correct
17 Execution timed out 18062 ms 168184 KB Time limit exceeded
18 Halted 0 ms 0 KB -