CSES - Datatähti 2018 alku - Results
Submission details
Task:Kyselyt
Sender:Yytsi
Submission time:2018-09-24 15:46:42 +0300
Language:C++
Status:READY
Result:25
Feedback
groupverdictscore
#10
#2ACCEPTED25
#30
Test results
testverdicttimegroup
#10.02 s1details
#2ACCEPTED0.03 s2details
#30.01 s3details

Code

#include <bits/stdc++.h>
using namespace std;
#define FOR(i, a, b) for (int i=a; i<(b); i++)
#define IO ios_base::sync_with_stdio(0); cin.tie(0)
typedef long long ll;

ll q;
ll r[20];

ll solve(ll k) {
	ll d = 0;
	FOR(i,1,18) if (k < r[i]) { d = i; break; } 
	ll n = r[d-1] + 1;
	ll b = (k - n) / d;
	ll p = n + b * d;
	ll w = d - 1 - (k - p);
	ll r = (ll)(b / pow(10,w)) % 10;
	if (w == d-1) r++;
	return r;
}

int main() {
	IO; cin>>q;
	r[1] = 9;
	FOR(d,2,18) r[d] = r[d-1]+d*9*pow(10,d-1);
	FOR(inp,0,q) {
		ll k; cin>>k;
		cout << solve(k) << "\n";
	}
}

Test details

Test 1

Group: 1

Verdict:

input
1000
582
214
723
273
...

correct output
0
1
7
7
6
...

user output
0
1
7
7
6
...

Test 2

Group: 2

Verdict: ACCEPTED

input
1000
615664
916441
627600
279508
...

correct output
1
2
3
2
2
...

user output
1
2
3
2
2
...

Test 3

Group: 3

Verdict:

input
1000
672274832941907421
260504693279721732
646999966092970935
100853063389774434
...

correct output
7
2
2
0
9
...

user output
4
0
4
6
9
...