「SP2713」GSS4 - Can you answer these queries IV
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Luogu
解题思路
区间开方以及区间求和。
考虑用线段树来做。
开方操作看似没有任何结合律可言,但这题有另外一个性质:
一个数的初始值不超过 (10^{18}) ,而这个数被开方6次左右就可以到1或0,并且1和0都是不需要再开方的。
所以我们记一下每个节点代表区间的最大值,若该值小于等于1,那么就不需要再进入下一层递归,否则就向下递归修改,修改次数最坏也不过是 (O(6n)) 左右,线段树完全没压力,于是这题就做完了。
细节注意事项
- 咕咕咕
参考代码
#include <algorithm>
#include <iostream>
#include <cstring>
#include <cstdlib>
#include <cstdio>
#include <cctype>
#include <cmath>
#include <ctime>
#define rg register
using namespace std;
template < typename T > inline void read(T& s) {
s = 0; int f = 0; char c = getchar();
while (!isdigit(c)) f |= (c == '-'), c = getchar();
while (isdigit(c)) s = s * 10 + (c ^ 48), c = getchar();
s = f ? -s : s;
}
typedef long long LL;
const int _ = 100010;
int n; LL a[_], sum[_ << 2], mx[_ << 2];
inline int lc(int rt) { return rt << 1; }
inline int rc(int rt) { return rt << 1 | 1; }
inline void pushup(int rt) {
sum[rt] = sum[lc(rt)] + sum[rc(rt)];
mx[rt] = max(mx[lc(rt)], mx[rc(rt)]);
}
inline void build(int rt = 1, int l = 1, int r = n) {
if (l == r) { mx[rt] = sum[rt] = a[l]; return; }
int mid = (l + r) >> 1;
build(lc(rt), l, mid), build(rc(rt), mid + 1, r), pushup(rt);
}
inline void update(int ql, int qr, int rt = 1, int l = 1, int r = n) {
if (mx[rt] <= 1) return;
if (l == r) { mx[rt] = sum[rt] = sqrt(sum[rt]); return; }
int mid = (l + r) >> 1;
if (ql <= mid) update(ql, qr, lc(rt), l, mid);
if (qr > mid) update(ql, qr, rc(rt), mid + 1, r);
pushup(rt);
}
inline LL query(int ql, int qr, int rt = 1, int l = 1, int r = n) {
if (ql <= l && r <= qr) return sum[rt];
int mid = (l + r) >> 1; LL res = 0;
if (ql <= mid) res += query(ql, qr, lc(rt), l, mid);
if (qr > mid) res += query(ql, qr, rc(rt), mid + 1, r);
return res;
}
int main() {
#ifndef ONLINE_JUDGE
freopen("in.in", "r", stdin);
#endif
int Case = 0;
while (scanf("%d", &n) != EOF) {
printf("Case #%d:
", ++Case);
for (rg int i = 1; i <= n; ++i) read(a[i]);
build();
int q; read(q);
for (rg int f, ql, qr; q--; ) {
read(f), read(ql), read(qr);
if (ql > qr) swap(ql, qr);
if (!f) update(ql, qr);
else printf("%lld
", query(ql, qr));
}
puts("");
}
return 0;
}
完结撒花 (qwq)
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$SP1043$ $GSS1$ $-$ $Can$ $you$ $answer$ $these$ $queries$ $I$