Submission #914512

#	Time	Username	Problem	Language	Result	Execution time	Memory
914512		yellowtoad	Sterilizing Spray (JOI15_sterilizing)	C++17	100 / 100	242 ms	6720 KiB

sterilizing

#include <iostream>
using namespace std;

long long n, test, k, a[100010], node[400010];

void build(int id, int x, int y) {
	if (x == y) {
		node[id] = a[x];
		return;
	}
	int mid = (x+y)/2;
	build(id*2,x,mid);
	build(id*2+1,mid+1,y);
	node[id] = node[id*2]+node[id*2+1];
}

void update(int id, int x, int y, int pos, int val) {
	if (x == y) {
		node[id] = val;
		return;
	}
	int mid = (x+y)/2;
	if (pos <= mid) update(id*2,x,mid,pos,val);
	else update(id*2+1,mid+1,y,pos,val);
	node[id] = node[id*2]+node[id*2+1];
}

void spray(int id, int x, int y, int l, int r) {
	if (node[id] == 0) return;
	if ((y < l) || (r < x)) return;
	if (x == y) {
		node[id] /= k;
		return;
	}
	int mid = (x+y)/2;
	spray(id*2,x,mid,l,r);
	spray(id*2+1,mid+1,y,l,r);
	node[id] = node[id*2]+node[id*2+1];
}

long long sum(int id, int x, int y, int l, int r) {
	if ((l <= x) && (y <= r)) return node[id];
	if ((y < l) || (r < x)) return 0;
	int mid = (x+y)/2;
	return sum(id*2,x,mid,l,r)+sum(id*2+1,mid+1,y,l,r);
}

int main() {
	cin >> n >> test >> k;
	for (int i = 1; i <= n; i++) cin >> a[i];
	build(1,1,n);
	while (test--) {
		int type, l, r;
		cin >> type >> l >> r;
		if (type == 1) update(1,1,n,l,r);
		if ((type == 2) && (k > 1)) spray(1,1,n,l,r);
		if (type == 3) cout << sum(1,1,n,l,r) << "\n";
	}
}

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