完全平方数
https://ac.nowcoder.com/acm/contest/5203/C
#include<bits/stdc++.h> using namespace std; int n; int l,r; int ans; int main() { //freopen("in","r",stdin); ios::sync_with_stdio(0); cin >> n; while(n--){ ans = 0; cin >> l >> r; ans = (int)sqrt(r) - (int)sqrt(l); int t = (int)sqrt(l); if(t * t == l) ans++; cout << ans << endl; } return 0; }