Exponentiation

input/code.cpp:5:24: warning: multi-character character constant [-Wmultichar]
    5 | const long long MOD = 1'000'000'007;
      |                        ^~~~~
input/code.cpp:5:32: warning: missing terminating ' character
    5 | const long long MOD = 1'000'000'007;
      |                                ^
input/code.cpp:5:32: error: missing terminating ' character
    5 | const long long MOD = 1'000'000'007;
      |                                ^~~~~
input/code.cpp:5:24: error: expected ',' or ';' before '\x303030'
    5 | const long long MOD = 1'000'000'007;
      |                        ^~~~~
input/code.cpp: In function 'int main()':
input/code.cpp:31:17: error: 'fastpow' was not declared in this scope
   31 |         cout << fastpow(as[i], bs[i]) << endl;
      |                 ^~~~~~~

#include <bits/stdc++.h>
 
using namespace std;
 
const long long MOD = 1'000'000'007;

 
long long fastpow(long long x, long long n) {
    if (n == 0) 
        return 1;
    if (n & 1 == 1) 
        return x * fastpow(x, n-1) % MOD;
    long long halfpow = fastpow(x, n/2);
    return halfpow*halfpow % MOD;
} 
 
int main() {
    int n;
    cin >> n;
 
    vector<long long> as(n), bs(n);
 
    for (int i = 0; i < n; i++)
    {
        cin >> as[i];
        cin >> bs[i];
    }
    
    for (int i = 0; i < n; i++)
    {
        cout << fastpow(as[i], bs[i]) << endl;
    }
    
    return 0;
}