Submission #562789

#	Time	Username	Problem	Language	Result	Execution time	Memory
562789		SSRS	Sterilizing Spray (JOI15_sterilizing)	C++14	0 / 100	150 ms	1228 KiB

sterilizing

#include <bits/stdc++.h>
using namespace std;
struct binary_indexed_tree{
  int N;
  vector<long long> BIT;
  binary_indexed_tree(int N): N(N), BIT(N + 1, 0){
  }
  void add(int i, int x){
    i++;
    while (i <= N){
      BIT[i] += x;
      i += i & -i;
    }
  }
  long long sum(int i){
    long long ans = 0;
    while (i > 0){
      ans += BIT[i];
      i -= i & -i;
    }
    return ans;
  }
  long long sum(int L, int R){
    return sum(R) - sum(L);
  }
};
int main(){
  int N, Q, K;
  cin >> N >> Q >> K;
  vector<int> C(N);
  for (int i = 0; i < N; i++){
    cin >> C[i];
  }
  binary_indexed_tree BIT(N);
  for (int i = 0; i < N; i++){
    BIT.add(i, C[i]);
  }
  for (int i = 0; i < Q; i++){
    int S, T, U;
    cin >> S >> T >> U;
    if (S == 1){
      BIT.add(T, -C[T]);
      C[T] = U;
      BIT.add(T, U);
    }
    if (S == 3){
      T--;
      cout << BIT.sum(T, U) << endl;
    }
  }
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 75