#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ar array
#define f first
#define s second
#define mpr make_pair
#define pb push_back
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()
#define FOR(i, a, b) for(auto i = a; i < b; i++)
#define FORD(i, a, b) for(auto i = a - 1; i >= b; i--)
#define trav(x, v) for(auto x : v)
#define fastio ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define fileio freopen("input.txt", "r", stdin); freopen("output.txt", "w", stdout);
// --------------- SOLUTION --------------- //
const int MOD = 1e9+7;
const int mxN = 1e6+7;
int n, k, x[mxN];
int getAns(int n, int k) {
if (n == 0) return 1;
if (k % 2 == 1) return getAns(n - 1, (k + 1) / 2);
if (k % 2 == 0) return (getAns(n - 1, k / 2) + (x[n - 1]) % MOD));
}
void solve() {
cin >> n >> k;
memset(x, 1, sizeof(x));
FOR(i, 1, n) {
x[i] = (x[i - 1] * 2) % MOD;
}
cout << getAns(n, k) << "\n";
}
int main() {
fastio;
//fileio;
int tests = 1;
// cin >> tests;
while (tests--) {
solve();
}
return 0;
}
Compilation message
rack.cpp: In function 'int getAns(int, int)':
rack.cpp:31:67: error: expected ';' before ')' token
31 | if (k % 2 == 0) return (getAns(n - 1, k / 2) + (x[n - 1]) % MOD));
| ^
| ;
rack.cpp:31:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
31 | if (k % 2 == 0) return (getAns(n - 1, k / 2) + (x[n - 1]) % MOD));
| ^~
rack.cpp:31:67: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
31 | if (k % 2 == 0) return (getAns(n - 1, k / 2) + (x[n - 1]) % MOD));
| ^
rack.cpp:31:67: error: expected primary-expression before ')' token
rack.cpp:32:1: warning: control reaches end of non-void function [-Wreturn-type]
32 | }
| ^
