| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 464924 |
2021-08-14T13:11:40 Z |
Tsovak |
Rack (eJOI19_rack) |
C++17 |
|
0 ms |
204 KB |
// -------------------- Includes -------------------- //
#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <stdio.h>
#include <cstdlib>
#include <stdlib.h>
#include <array>
#include <string>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <math.h>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <vector>
#include <stack>
#include <queue>
#include <deque>
#include <bitset>
#include <list>
#include <iterator>
#include <numeric>
#include <complex>
#include <tuple>
#include <utility>
#include <cassert>
#include <assert.h>
#include <climits>
#include <limits.h>
#include <ctime>
#include <time.h>
#include <random>
#include <chrono>
#include <fstream>
using namespace std;
// -------------------- Typedefs -------------------- //
typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef long double ld;
// -------------------- Defines -------------------- //
#define pr pair
#define mpr make_pair
#define ff first
#define ss second
#define mset multiset
#define mmap multimap
#define uset unordered_set
#define umap unordered_map
#define umset unordered_multiset
#define ummap unordered_multimap
#define pqueue priority_queue
#define sz(x) (int)x.size()
#define len(x) (int)x.length()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define clr(x) x.clear()
#define pf push_front
#define pb push_back
#define popf pop_front
#define popb pop_back
#define ft front
#define bk back
#define lb lower_bound
#define ub upper_bound
#define bs binary_search
// -------------------- Constants -------------------- //
const int MAX = int(1e9 + 5);
const ll MAXL = ll(1e18 + 5);
const ull MOD = ll(1e9 + 7);
const ll MOD2 = ll(998244353);
// -------------------- Functions -------------------- //
void fastio()
{
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
return;
}
void precision(int x)
{
cout.setf(ios::fixed | ios::showpoint);
cout.precision(x);
return;
}
ll gcd(ll a, ll b)
{
if (a > b) {
swap(a, b);
}
if (a == 0) {
return b;
}
if (a == b) {
return a;
}
return gcd(b % a, a);
}
ll lcm(ll a, ll b)
{
return a / gcd(a, b) * b;
}
bool is_prime(ll a)
{
ll i;
for (i = 2; i * i <= a; i++) {
if (a % i == 0) {
return false;
}
}
return true;
}
bool is_square(ll a)
{
ll b = ll(sqrt(a));
return (b * b == a);
}
bool is_cube(ll a)
{
ll b = ll(cbrt(a));
return (b * b * b == a);
}
int digit_sum(ll a)
{
int sum = 0;
while (a) {
sum += int(a % 10);
a /= 10;
}
return sum;
}
ll binpow(ll a, int b)
{
ll ans = 1;
while (b) {
if ((b & 1) == 1) {
ans *= a;
}
b >>= 1;
a *= a;
}
return ans;
}
ull binpow_by_mod(ull a, ull b, ull mod)
{
ull ans = 1;
while (b) {
if ((b & 1) == 1) {
ans *= a;
ans %= mod;
}
b >>= 1;
a *= a;
a %= mod;
}
return ans;
}
ll factorial(int a)
{
int i;
ll ans = 1;
for (i = 2; i <= a; i++) {
ans *= ll(i);
}
return ans;
}
ll factorial_by_mod(int a, ll mod)
{
int i;
ll ans = 1;
for (i = 2; i <= a; i++) {
ans *= i;
ans %= mod;
}
return ans;
}
// -------------------- Solution -------------------- //
/*const int N = 200005;
int a[N];
int n;*/
void solve()
{
int i, j;
int n;
ull k;
cin >> n >> k;
ull l, r, mid;
ull r1, r2, rem;
if (k % 2 == 1) {
r1 = 1;
r2 = 3;
l = 1;
r = binpow_by_mod(2, ull(n) - 1, MOD);
ull x = 4;
for (i = 1; i < n; i++) {
mid = (l + r) / 2;
if (k < x) {
break;
}
rem = k % x;
if (rem == r1) {
r2 = r1 + x;
r = mid;
}
else {
r1 = r2;
r2 += x;
l = mid + 1;
}
l %= MOD;
r %= MOD;
x *= 2;
}
if (k == r2) {
cout << ((l + r) / 2 + 1) % MOD << endl;
}
else {
cout << l << endl;
}
}
else {
r1 = 2;
r2 = 0;
l = binpow_by_mod(2, ull(n) - 1, MOD) + 1;
l %= MOD;
r = binpow_by_mod(2, ull(n), MOD);
ull x = 4;
for (i = 1; i < n; i++) {
mid = (l + r) / 2;
if (k < x) {
break;
}
rem = k % x;
if (rem == r1) {
r2 = r1 + x;
r = mid;
}
else {
r1 = r2;
r2 += x;
l = mid + 1;
}
l %= MOD;
r %= MOD;
x *= 2;
}
if (k == r2) {
cout << ((l + r) / 2 + 1) % MOD << endl;
}
else {
cout << l << endl;
}
}
return;
}
void precalc()
{
return;
}
int main()
{
fastio();
precalc();
int tests = 1, tc;
//cin >> tests;
for (tc = 1; tc <= tests; tc++) {
solve();
}
//cout << db(clock()) / CLOCKS_PER_SEC << endl;
return 0;
}
/*
# # # # # # # # # # # # # # # # #
# # # # # # # # # #
# # # # # # # # # # # # #
# # # # # # # # # # # #
# # # # # # # # # # # # # #
*/
Compilation message
rack.cpp: In function 'void solve()':
rack.cpp:213:9: warning: unused variable 'j' [-Wunused-variable]
213 | int i, j;
| ^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
204 KB |
Output is correct |
| 2 |
Correct |
0 ms |
204 KB |
Output is correct |
| 3 |
Correct |
0 ms |
204 KB |
Output is correct |
| 4 |
Correct |
0 ms |
204 KB |
Output is correct |
| 5 |
Incorrect |
0 ms |
204 KB |
Output isn't correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
204 KB |
Output is correct |
| 2 |
Correct |
0 ms |
204 KB |
Output is correct |
| 3 |
Correct |
0 ms |
204 KB |
Output is correct |
| 4 |
Correct |
0 ms |
204 KB |
Output is correct |
| 5 |
Incorrect |
0 ms |
204 KB |
Output isn't correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
204 KB |
Output is correct |
| 2 |
Correct |
0 ms |
204 KB |
Output is correct |
| 3 |
Correct |
0 ms |
204 KB |
Output is correct |
| 4 |
Correct |
0 ms |
204 KB |
Output is correct |
| 5 |
Incorrect |
0 ms |
204 KB |
Output isn't correct |
