Bzoj3211: 花神游历各国

题面

Bzoj

Sol

暴力开根，一个数开根到小于等于(1)就不用管了，维护区间(max)，(max<=1)就不用管这个区间，线段树

# include <bits/stdc++.h>
# define RG register
# define IL inline
# define Fill(a, b) memset(a, b, sizeof(a))
using namespace std;
typedef long long ll;
const int _(1e5 + 5);

IL int Input(){
    RG int x = 0, z = 1; RG char c = getchar();
    for(; c < '0' || c > '9'; c = getchar()) z = c == '-' ? -1 : 1;
    for(; c >= '0' && c <= '9'; c = getchar()) x = (x << 1) + (x << 3) + (c ^ 48);
    return x * z;
}

int n, m;
ll mx[_ << 2], sum[_ << 2];

IL void Build(RG int x, RG int l, RG int r){
	if(l == r){
		mx[x] = sum[x] = Input();
		return;
	}
	RG int mid = (l + r) >> 1, ls = x << 1, rs = x << 1 | 1;
	Build(ls, l, mid), Build(rs, mid + 1, r);
	mx[x] = max(mx[ls], mx[rs]), sum[x] = sum[ls] + sum[rs];
}

IL void Modify(RG int x, RG int l, RG int r, RG int L, RG int R){
	if(mx[x] <= 1) return;
	if(l == r){
		sum[x] = mx[x] = sqrt(mx[x]);
		return;
	}
	RG int mid = (l + r) >> 1, ls = x << 1, rs = x << 1 | 1;
	if(L <= mid) Modify(ls, l, mid, L, R);
	if(R > mid) Modify(rs, mid + 1, r, L, R);
	mx[x] = max(mx[ls], mx[rs]), sum[x] = sum[ls] + sum[rs];
}

IL ll Query(RG int x, RG int l, RG int r, RG int L, RG int R){
	if(L <= l && R >= r) return sum[x];
	RG int mid = (l + r) >> 1; RG ll ret = 0;
	if(L <= mid) ret = Query(x << 1, l, mid, L, R);
	if(R > mid) ret += Query(x << 1 | 1, mid + 1, r, L, R);
	return ret;
}

int main(RG int argc, RG char* argv[]){
	n = Input(), Build(1, 1, n), m = Input();
	for(RG int i = 1; i <= m; ++i){
		RG int k = Input(), l = Input(), r = Input();
		if(k == 1) printf("%lld
", Query(1, 1, n, l, r));
		else Modify(1, 1, n, l, r);
	}
	return 0;
}