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View Compilation Error

0_0_29617379_25947.cpp: In function 'int main()':
0_0_29617379_25947.cpp:23:51: error: 'mod' was not declared in this scope
         printf("%I64d\n", (quick_pow(2, n, p) - 2+mod )%mod);//这一步注意，不要为负数
                                                   ^


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