Submission #763539

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
763539	2023-06-22 12:32:56	drdilyor	Radio Towers (IOI22_towers)	C++17	23 / 100	4027 ms	15580 KiB

towers

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#include <bits/stdc++.h>
#include "towers.h"
using namespace std;
using ll = long long;
template<typename T, typename Op>
struct SparseTable {
    vector<vector<T>> sparse;
    Op accum_func;
    SparseTable() = default;
    SparseTable(const vector<T>& arr, const Op func) : accum_func(func) {
        int n = arr.size();
        int logn = 32 - __builtin_clz(n);
        sparse.resize(logn, vector<T>(n));
        sparse[0] = arr;
        for (int lg = 1; lg < logn; lg++) {
            for (int i = 0; i + (1 << lg) <= n; i++) {
                sparse[lg][i] = accum_func(sparse[lg - 1][i], sparse[lg - 1][i + (1 << (lg - 1))]);
            }
        }
    }
    T find(int l, int r) { // [l, r]
        r++;
        int cur_log = 31 - __builtin_clz(r - l);
        return accum_func(sparse[cur_log][l], sparse[cur_log][r - (1 << cur_log)]);
    }
};
 
 
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