QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#402588 | #6744. Square | mulberry# | AC ✓ | 106ms | 3604kb | C++23 | 1.1kb | 2024-04-30 23:17:50 | 2024-04-30 23:17:51 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
#define int long long
void solve()
{
int l,r;
cin>>l>>r;
if(l>=r) cout<<l-r<<'\n';
else
{
auto Sol=[&](int x)->int
{
int st=(int)(1.0*sqrtl(2LL*x)+1.5);
int sum=r-x;
int l=st,r=(int)1e12;
while(l+1<r)
{
int mid=(l+r)/2;
if((__int128)(st+mid)*(mid-st+1)/2>=sum) r=mid;
else l=mid;
}
if((__int128)(st+l)*(l-st+1)/2>=sum) return (__int128)(st+l)*(l-st+1)/2-sum + (l-st+1);
else return (__int128)(st+r)*(r-st+1)/2-sum + (r-st+1);
};
// cout<<Sol(l)<<' '<<Sol(l-1)+1<<'\n';
int k=(int)(1.0*sqrtl(2LL*l)+1.5);
int lower=(1+k-2)*(k-2)/2;
// cout<<lower<<'\n';
cout<<min(Sol(l),Sol(lower)+l-lower)<<'\n';
}
}
signed main()
{
ios::sync_with_stdio;
cin.tie(0);
int T;cin>>T;
while (T--) solve();
return 0;
}
/*
3
10 1000000000000000000
1 1000000000000000000
1000000000000000000 1
*/
Details
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Test #1:
score: 100
Accepted
time: 1ms
memory: 3604kb
input:
2 5 1 1 5
output:
4 3
result:
ok 2 number(s): "4 3"
Test #2:
score: 0
Accepted
time: 106ms
memory: 3604kb
input:
100000 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 10 1 11 1 12 1 13 1 14 1 15 1 16 1 17 1 18 1 19 1 20 1 21 1 22 1 23 1 24 1 25 1 26 1 27 1 28 1 29 1 30 1 31 1 32 1 33 1 34 1 35 1 36 1 37 1 38 1 39 1 40 1 41 1 42 1 43 1 44 1 45 1 46 1 47 1 48 1 49 1 50 1 51 1 52 1 53 1 54 1 55 1 56 1 57 1 58 1 59 1 60 1 ...
output:
0 2 1 4 3 2 6 5 4 3 8 7 6 5 4 10 9 8 7 6 5 12 11 10 9 8 7 6 14 13 12 11 10 9 8 7 16 15 14 13 12 11 10 9 8 18 17 16 15 14 13 12 11 10 9 20 19 18 17 16 15 14 13 12 11 10 22 21 20 19 18 17 16 15 14 13 12 11 24 23 22 21 20 19 18 17 16 15 14 13 12 26 25 24 23 22 21 20 19 18 1 0 2 2 1 3 4 3 2 4 6 5 4 3 5 ...
result:
ok 100000 numbers