Submission #784568

#	Time	Username	Problem	Language	Result	Execution time	Memory
784568		Acanikolic	Sterilizing Spray (JOI15_sterilizing)	C++14	90 / 100	130 ms	9420 KiB

sterilizing

#include <bits/stdc++.h>
 
#define ll long long 

#define int long long 
 
#define pb push_back 

#define F first
 
#define S second
 
using namespace std;
 
const long long N = 1e5+10;
 
const long long mod = 1e9+7;
 
const long long inf = 1e18;

vector<int>ft(N);

void update(int index,int n,int val) {
	while(index <= n) {
		ft[index] += val;
		index += index & -index; 
	}
}

int get(int x) {
	int X = 0;
	while(x >= 1) {
		X += ft[x];
		x -= x & -x;
	}
	return X;
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    
	int n,Q,k;
	cin >> n >> Q >> k;
	vector<int>a(n+1);
	for(int i=1;i<=n;i++) {
		cin >> a[i];
		update(i,n,a[i]);
	}
	if(k == 1) {
		while(Q--) {
			int type;
			cin >> type;
			if(type == 1) {
				int index,val;
				cin >> index >> val;
				update(index,n,val-a[index]);
				a[index] = val;
			}
			else if(type == 2) {
				int l,r;
				cin >> l >> r;
			}
			else {
				int l,r;
				cin >> l >> r;
				cout << get(r)-get(l-1) << '\n';
			}
		}
		return 0;
	}
	set<int>st;
	for(int i=1;i<=n;i++) {
		if(a[i] >= 1) st.insert(i);
	}
	while(Q--) {
		int type;
		cin >> type;
		if(type == 1) {
			int index,val;
			cin >> index >> val;
			update(index,n,val-a[index]);
			a[index] = val;
			if(st.find(index) == st.end() && val > 1) st.insert(index);
		}
		else if(type == 2) {
			int l,r;
			cin >> l >> r;
			auto lb = st.lower_bound(l);
			vector<int>X;
			//cout << "menjam : ";
			for(lb;lb!=st.end()&&*lb<=r;lb++) {
				int x = a[*lb]/k;
				update(*lb,n,x-a[*lb]);
				//cout << *lb << ' ' << get(*lb)-get(*lb-1) << endl;
				a[*lb] = x;
				if(a[*lb] == 0) X.pb(*lb);
			}
			//cout << endl;
			for(int i=0;i<X.size();i++) st.erase(X[i]);
			//for(int i=1;i<=n;i++) cout << get(i) << ' ';
			//cout << endl;
		}
		else {
			int l,r;
			cin >> l >> r;
			cout << get(r)-get(l-1) << '\n';
		}
	}
    return 0;
}

Compilation message (stderr)

sterilizing.cpp: In function 'int main()':
sterilizing.cpp:93:8: warning: statement has no effect [-Wunused-value]
   93 |    for(lb;lb!=st.end()&&*lb<=r;lb++) {
      |        ^~
sterilizing.cpp:101:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  101 |    for(int i=0;i<X.size();i++) st.erase(X[i]);
      |                ~^~~~~~~~~

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