제출 #510859

#	제출 시각UTC-0	아이디	문제	언어	결과	실행 시간	메모리
510859	2022-01-15 03:29:00	KoD	Ekoeko (COCI21_ekoeko)	C++17	110 / 110	24 ms	3244 KiB

Main

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#include <bits/stdc++.h>
using std::vector;
using std::array;
using std::pair;
using std::tuple;
struct Fenwick {
    int size;
    vector<int> data;
    Fenwick(const int n) : size(n), data(n + 1) {}
    void add(int i, const int x) {
        i += 1;
        while (i <= size) {
            data[i] += x;
            i += i & -i;
        }
    }
    int pref(int i) const {
        int ret = 0;
        while (i > 0) {
            ret += data[i];
            i -= i & -i;
        }
        return ret;
    }
    int sum(const int l, const int r) const {
        return pref(r) - pref(l);
    }
};
 
 
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