Submission #997410

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
997410	2024-06-12 09:20:34	goats_9	Railway (BOI17_railway)	C++17	100 / 100	72 ms	30156 KiB

railway

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/* Author: goats_9 */
#include <bits/stdc++.h>
using namespace std;
#define LSOne(s) (s & (-s))
using ll = long long;
const int LOG = 20;
class BIT {
  int n;
  vector<int> ft;
public:
  BIT(int _n) : n(_n), ft(n + 1, 0) {}
  void update(int i, int v) {
    for (; i <= n; i += LSOne(i)) ft[i] += v;
  }
  int query(int l, int r) {
    int ans = 0;
    for (; r; r -= LSOne(r)) ans += ft[r];
    for (l--; l; l -= LSOne(l)) ans -= ft[l];
    return ans;
  }
};
int main() {
 
 
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