Submission #143080

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
143080	2019-08-13 00:36:25	model_code	Arranging Shoes (IOI19_shoes)	C++17	100 / 100	49 ms	3960 KiB

shoes

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// model solution
#include "shoes.h"
using namespace std;
class Fenwick
{
    vector<int> a;
    int count(int right)
    {
        int cnt = 0;
        for (; right >= 0; right = (right & (right + 1)) - 1)
        {
            cnt += a[right];
        }
        return cnt;
    }
public:
    explicit Fenwick(int n)
    {
        a.assign(n, 0);
    }
    int count(int left, int right)
    {
        return count(right) - count(left - 1);
    }
 
 
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• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 15 / 15
• Subtask 5: 20 / 20
• Subtask 6: 15 / 15