0_0_34761345_23554.cpp:2:7: error: 'MOD' does not name a type
const MOD = 1e9 + 7;
^
0_0_34761345_23554.cpp: In function 'int fast_power(long long int, long long int)':
0_0_34761345_23554.cpp:12:21: error: 'MOD' was not declared in this scope
n = n * n % MOD;
^
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