Submission #983932

#	Time	Username	Problem	Language	Result	Execution time	Memory
983932		WongYiKai	Seats (IOI18_seats)	C++14	5 / 100	4065 ms	262144 KiB

seats

#include "seats.h"



#include <bits/stdc++.h>
using namespace std;

typedef int ll;

struct node {
    int s, e;
    ll mn, mx, sum;
    bool lset;
    ll add_val, set_val;
    node *l, *r;
    node (int _s, int _e, int A[] = NULL): s(_s), e(_e), mn(0), mx(0), sum(0), lset(0), add_val(0), set_val(0), l(NULL), r(NULL) {
        if (A == NULL) return;
        if (s == e) mn = mx = sum = A[s];
        else {
            l = new node(s, (s+e)>>1, A), r = new node((s+e+2)>>1, e, A);
            combine();
        }
    }
    void create_children() {
        if (s == e) return;
        if (l != NULL) return;
        int m = (s+e)>>1;
        l = new node(s, m);
        r = new node(m+1, e);
    }
    void self_set(ll v) {
        lset = 1;
        mn = mx = set_val = v;
        sum = v * (e-s+1);
        add_val = 0;
    }
    void self_add(ll v) {
        if (lset) { self_set(v + set_val); return; }
        mn += v, mx += v, add_val += v;
        sum += v*(e-s+1);
    }
    void lazy_propagate() {
        if (s == e) return;
        if (lset) {
            l->self_set(set_val), r->self_set(set_val);
            lset = set_val = 0;
        }   
        if (add_val != 0) {
            l->self_add(add_val), r->self_add(add_val);
            add_val = 0;
        }
    }
    void combine() {
        if (l == NULL) return;
        sum = l->sum + r->sum;
        mn = min(l->mn, r->mn);
        mx = max(l->mx, r->mx);
    }
    void add(int x, int y, ll v) {
        if (s == x && e == y) { self_add(v); return; }
        int m = (s+e)>>1;
        create_children(); lazy_propagate();
        if (x <= m) l->add(x, min(y, m), v);
        if (y > m) r->add(max(x, m+1), y, v);
        combine();
    }
    void set(int x, int y, ll v) {
        if (s == x && e == y) { self_set(v); return; }
        int m = (s+e)>>1;
        create_children(); lazy_propagate();
        if (x <= m) l->set(x, min(y, m), v);
        if (y > m) r->set(max(x, m+1), y, v);
        combine();
    }
    ll range_sum(int x, int y) {
        if (s == x && e == y) return sum;
        if (l == NULL || lset) return (sum / (e-s+1)) * (y-x+1);
        int m = (s+e)>>1;
        lazy_propagate();
        if (y <= m) return l->range_sum(x, y);
        if (x > m) return r->range_sum(x, y);
        return l->range_sum(x, m) + r->range_sum(m+1, y);
    }
    ll range_min(int x, int y) {
        if (s == x && e == y) return mn;
        if (l == NULL || lset) return mn;
        int m = (s+e)>>1;
        lazy_propagate();
        if (y <= m) return l->range_min(x, y);
        if (x > m) return r->range_min(x, y);
        return min(l->range_min(x, m), r->range_min(m+1, y));
    }
    ll range_max(int x, int y) {
        if (s == x && e == y) return mx;
        if (l == NULL || lset) return mx;
        int m = (s+e)>>1;
        lazy_propagate();
        if (y <= m) return l->range_max(x, y);
        if (x > m) return r->range_max(x, y);
        return max(l->range_max(x, m), r->range_max(m+1, y));
    }
    ~node() {
        if (l != NULL) delete l;
        if (r != NULL) delete r;
    }
} *root,*root2,*root3,*root4;


ll h,w,n;

void give_initial_chart(int H, int W, vector<int> R, vector<int> C) {
	h = H;
	w = W;
	
	n = h*w;
    root = new node(0,1000100);
    root2 = new node(0,1000100);
    root3 = new node(0,1000100);
	//root -> row
	//root2 -> col
	//root3 -> yes/no
	int high1=0,high2=0,low1=2000000,low2=2000000;
	for (int i=0;i<n;i++){
		root->set(i,i,R[i]);
		root2->set(i,i,C[i]);
		
		low2 = min(low2,C[i]); //left
		low1 = min(low1,R[i]); //top
		high2 = max(high2,C[i]); //right
		high1 = max(high1,R[i]); //bottom
		ll siz = (high2-low2+1)*(high1-low1+1);
		if (siz==i+1) {
		    root3->set(i,i,1);
		}
		//cout << root3->range_sum(i,i) << "\n";
	}
}

ll left2,right2,top2,bottom2;
ll temp;
ll r,c,ind,ind2;
int swap_seats(int a, int b) {
    
    if (a>b){
        temp=a;
        a=b;
        b=temp;
    }
    //everything >=b doesnt change
    //everything <a doesnt change
    //everything between them wont work anymore
    root3->set(a,b-1,0);
    r = root->range_sum(a,a);
    c = root2->range_sum(a,a);
    root->set(a,a,root->range_sum(b,b));
    root->set(b,b,r);
    root2->set(a,a,root2->range_sum(b,b));
    root2->set(b,b,c);
    ind=a;
    while (ind<b){
        if (ind==0){
            root3->set(0,0,1);
            ind=1;
            continue;
        }
        left2=root2->range_min(0,ind);
		right2=root2->range_max(0,ind);
		top2=root->range_min(0,ind);
		bottom2=root->range_max(0,ind);
		ind2 = (right2-left2+1)*(bottom2-top2+1)-1;
		//cout << ind << " " << ind2 << "\n";
		if (ind2==ind) {
		    root3->set(ind,ind,1);
		    ind = ind2+1;
		}
		else ind=ind2;
    }
    return root3->range_sum(0,n-1);
}

Compilation message (stderr)

seats.cpp: In member function 'void node::lazy_propagate()':
seats.cpp:46:28: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   46 |             lset = set_val = 0;
      |                    ~~~~~~~~^~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 6
• Subtask 3: 0 / 20
• Subtask 4: 0 / 6
• Subtask 5: 0 / 33
• Subtask 6: 0 / 30