Warning: skipping dependency checks.
BigInt.cpp: In member function ‘BigInt BigInt::inv(const BigInt&) const’:
BigInt.cpp:1411:12: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings]
    bi_p[0] = (const char *)"0";
            ^
BigInt.cpp:1447:10: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings]
   bi_ret = (const char *)"0";
          ^
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