Submission #126839

#	Time	Username	Problem	Language	Result	Execution time	Memory
126839		MohamedAhmed04	Examination (JOI19_examination)	C++14	0 / 100	3053 ms	53940 KiB

examination

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp> // Common file
#include <ext/pb_ds/tree_policy.hpp> // Including tree_order_statistics_node_update
using namespace std;
using namespace __gnu_pbds;
const int MAX = 1e5 + 5 ;
const int MAX2 = 1e5 ;

typedef tree<
pair<int , int>,
null_type,
less< pair<int , int> >,
rb_tree_tag,
tree_order_statistics_node_update>
ordered_set;

ordered_set bit[MAX] ;

void update(int x , int y)
{
    for(int i = x ; i < MAX ; i += i & -i)
        bit[i].insert({y , x}) ;
}

int query(int x , int y)
{
    int ans = 0 ;
    for(int i = x ; i > 0 ; i -= i & -i)
        ans += bit[i].order_of_key(make_pair(y+1 , 0)) ;
    return ans ;
}

/*int query(int x , int y)
{
    int ans = 0 ;
    while(x > 0)
    {
        int y1 = y ;
        while(y1 > 0)
        {
            ans += bit[{x , y1}] ;
            y1 -= (y1 & -y1) ;
        }
        x -= (x & -x) ;
    }
    return ans ;
}*/

int main()
{
    ios::sync_with_stdio(0) ;
    cin.tie(0) ;
    int n , q ;
    cin>>n>>q ;
    int a[n] , b[n] ;
    for(int i = 0 ; i < n ; ++i)
    {
        cin>>a[i]>>b[i] ;
        update(a[i] , b[i]) ;
    }
    const int N = 1e5 ;
    while(q--)
    {
        int x , y , z ;
        scanf("%d %d %d" , &x , &y , &z) ;
        cout<<query(N , N) - query(x-1 , N) - query(N , y-1) + query(x-1 , y-1)<<"\n";
    }
    return 0 ;
}

Compilation message (stderr)

examination.cpp: In function 'int main()':
examination.cpp:65:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d %d" , &x , &y , &z) ;
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 2
• Subtask 2: 0 / 20
• Subtask 3: 0 / 21
• Subtask 4: 0 / 57