Submission #562777

#	Time	Username	Problem	Language	Result	Execution time	Memory
562777		SSRS	Sterilizing Spray (JOI15_sterilizing)	C++14	10 / 100	180 ms	4064 KiB

sterilizing

#include <bits/stdc++.h>
using namespace std;
struct lazy_segment_tree{
  int N;
  vector<int> ST, lazy;
  lazy_segment_tree(vector<int> &A){
    int N2 = A.size();
    N = 1;
    while (N < N2){
      N *= 2;
    }
    ST = vector<int>(N * 2 - 1, 0);
    for (int i = 0; i < N2; i++){
      ST[N - 1 + i] = A[i];
    }
    for (int i = N - 2; i >= 0; i--){
      ST[i] = ST[i * 2 + 1] + ST[i * 2 + 2];
    }
    lazy = vector<int>(N * 2 - 1, -1);
  }
  void eval(int i, int l, int r){
    if (lazy[i] != -1){
      if (i < N - 1){
        lazy[i * 2 + 1] = lazy[i];
        lazy[i * 2 + 2] = lazy[i];
      }
      ST[i] = lazy[i] * (r - l);
      lazy[i] = -1;
    }
  }
  void range_update(int L, int R, int x, int i, int l, int r){
    eval(i, l, r);
    if (r <= L || R <= l){
      return;
    } else if (L <= l && r <= R){
      lazy[i] = x;
      eval(i, l, r);
    } else {
      int m = (l + r) / 2;
      range_update(L, R, x, i * 2 + 1, l, m);
      range_update(L, R, x, i * 2 + 2, m, r);
      ST[i] = ST[i * 2 + 1] + ST[i * 2 + 2];
    }
  }
  void range_update(int L, int R, int x){
    range_update(L, R, x, 0, 0, N);
  }
  int range_sum(int L, int R, int i, int l, int r){
    eval(i, l, r);
    if (r <= L || R <= l){
      return 0;
    } else if (L <= l && r <= R){
      return ST[i];
    } else {
      int m = (l + r) / 2;
      return range_sum(L, R, i * 2 + 1, l, m) + range_sum(L, R, i * 2 + 2, m, r);
    }
  }
  int range_sum(int L, int R){
    return range_sum(L, R, 0, 0, N);
  }
};
int main(){
  int N, Q, K;
  cin >> N >> Q >> K;
  vector<int> C(N);
  for (int i = 0; i < N; i++){
    cin >> C[i];
  }
  lazy_segment_tree ST(C);
  for (int i = 0; i < Q; i++){
    int S, T, U;
    cin >> S >> T >> U;
    if (S == 1){
      T--;
      ST.range_update(T, T + 1, U);
    }
    if (S == 2){
      T--;
      if (K >= 2){
        ST.range_update(T, U, 0);
      }
    }
    if (S == 3){
      T--;
      cout << ST.range_sum(T, U) << endl;
    }
  }
}

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