SP2713 GSS4 - Can you answer these queries IV

#include 
#define int long long
using namespace std;
const int N = 1e5 + 10;
int n, m;
int w[N];
struct Node {
    int l, r;
    int tag, sum;
}tr[N * 4];
void pushup(int u)
{
    tr[u].sum = tr[u << 1].sum + tr[u << 1 | 1].sum;
}
void build(int u, int l, int r)
{
    if (l == r) {tr[u] = {l, r, 0, w[l]}; return;}
    tr[u] = {l, r};
    int mid = l + r >> 1;
    build(u << 1, l, mid);
    build(u << 1 | 1, mid + 1, r);
    pushup(u);
}
void modify(int u, int l, int r)
{
    if (tr[u].r - tr[u].l + 1 == tr[u].sum) return;
    if (tr[u].l == tr[u].r) {
        tr[u].sum = (int)sqrt(tr[u].sum * 1.0);
        return;
    }
    int mid = tr[u].l + tr[u].r >> 1;
    if (l <= mid)   modify(u << 1, l, r);
    if (r > mid)    modify(u << 1 | 1, l, r);
    pushup(u);
}
int query(int u, int l, int r)
{
    if (tr[u].l >= l && tr[u].r <= r)   return tr[u].sum;
    int res = 0;
    int mid = tr[u].l + tr[u].r >> 1;
    if (l <= mid)   res = query(u << 1, l, r);
    if (r > mid)    res += query(u << 1 | 1, l, r);
    return res;
}
signed main() {
    int cases = 1;
    while (scanf("%lld", &n) != EOF) {
        printf("Case #%lld:\n", cases ++);
        for (int i = 1; i <= n; i ++ )  scanf("%lld", &w[i]);
        build(1, 1, n);
        scanf("%lld", &m);
        while (m -- ) {
            int type, l, r;
            scanf("%lld%lld%lld", &type, &l, &r);
            if (type == 0) modify(1, l, r);
            else {
                if (l > r)  swap(l, r);
                printf("%lld\n", query(1, l, r));
            }
        }
        puts("");
    }
    return 0;
}