Submission #999352

#	Time	Username	Problem	Language	Result	Execution time	Memory
999352		yoav_s	Star Trek (CEOI20_startrek)	C++17	0 / 100	0 ms	348 KiB

startrek

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef vector<ll> v;
typedef vector<v> vv;
typedef vector<vv> vvv;
typedef pair<ll,ll> p;
typedef vector<p> vp;
typedef vector<vp> vvp;
typedef vector<vvp> vvvp;
typedef pair<ll, p> tri;
typedef vector<tri> vtri;
typedef vector<vtri> vvtri;
typedef vector<vvtri> vvvtri;
typedef vector<bool> vb;
typedef vector<vb> vvb;
typedef vector<vvb> vvvb;

#define f first
#define s second
#define pb push_back
#define eb emplace_back
#define all(v) (v).begin(),(v).end()

const ll INF = 1e18;
const ll mod = 1e9 + 7;

ll modPow(ll a, ll b)
{
    if (b == 0) return 1;
    ll res = modPow(a, b / 2);
    res = (res * res) % mod;
    if (b % 2 == 1) res = (res * a) % mod;
    return res;
}

int main()
{
    ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
    ll N, D;
    cout << modPow(4, D - 1) << "\n";
    return 0;
}

Compilation message (stderr)

startrek.cpp: In function 'int main()':
startrek.cpp:42:8: warning: unused variable 'N' [-Wunused-variable]
   42 |     ll N, D;
      |        ^
startrek.cpp:43:28: warning: 'D' is used uninitialized in this function [-Wuninitialized]
   43 |     cout << modPow(4, D - 1) << "\n";
      |                            ^

• Subtask 1: 0 / 0
• Subtask 2: 0 / 7
• Subtask 3: 0 / 8
• Subtask 4: 0 / 15
• Subtask 5: 0 / 15
• Subtask 6: 0 / 20
• Subtask 7: 0 / 20
• Subtask 8: 0 / 15