#include <bits/stdc++.h>
using namespace std;
#define int long long
#define FASTIO ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define all(x) (x).begin(), (x).end()
#define pb push_back
#define pii pair<int, int>
#define ff first
#define ss second
#define PI acos(-1)
#define ld long double
template <class T> bool ckmin(T& a, const T& b) {return a > b ? a = b, true : false;}
template <class T> bool ckmax(T& a, const T& b) {return a < b ? a = b, true : false;}
const int mod = 1e9+7, N = 2e5+5;
int msb(int val){return sizeof(int)*8-__builtin_clzll(val);}
int a[N], n, m, k;
void solve(int test_case){
int i, j;
cin >> n;
int l=0, r=n;
while(l+1 < r){
int mid = (l+r)/2;
if(mid*(mid+1)/2 < n){
l = mid;
}else r = mid;
}
int lst = l*(l+1)/2;
int start = lst*2-l+1;
start += (n-lst-1)*2;
cout << start << '\n';
return;
}
signed main(){
FASTIO;
#define MULTITEST 0
#if MULTITEST
int _T;
cin >> _T;
for(int T_CASE = 1; T_CASE <= _T; T_CASE++)
solve(T_CASE);
#else
solve(1);
#endif
return 0;
}
Compilation message
oddeven.cpp: In function 'void solve(long long int)':
oddeven.cpp:19:6: warning: unused variable 'i' [-Wunused-variable]
19 | int i, j;
| ^
oddeven.cpp:19:9: warning: unused variable 'j' [-Wunused-variable]
19 | int i, j;
| ^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
384 KB |
Output is correct |
| 2 |
Correct |
1 ms |
364 KB |
Output is correct |
| 3 |
Correct |
0 ms |
364 KB |
Output is correct |
| 4 |
Correct |
0 ms |
364 KB |
Output is correct |
| 5 |
Correct |
0 ms |
364 KB |
Output is correct |
| 6 |
Correct |
1 ms |
376 KB |
Output is correct |
| 7 |
Incorrect |
1 ms |
384 KB |
Output isn't correct |
| 8 |
Halted |
0 ms |
0 KB |
- |
