0_0_2091883_2837.cpp: In function `int main()':
0_0_2091883_2837.cpp:3: error: `bignum' undeclared (first use this function)
0_0_2091883_2837.cpp:3: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2091883_2837.cpp:3: error: expected `;' before "a"
0_0_2091883_2837.cpp:3: error: `a' undeclared (first use this function)
0_0_2091883_2837.cpp:3: error: `cout' undeclared (first use this function)
0_0_2091883_2837.cpp:3: error: `endl' undeclared (first use this function)
0_0_2091883_2837.cpp: At global scope:
0_0_2091883_2837.cpp:4: error: expected unqualified-id before numeric constant
0_0_2091883_2837.cpp:4: error: expected `,' or `;' before numeric constant
0_0_2091883_2837.cpp: In function `int main()':
0_0_2091883_2837.cpp:9: error: redefinition of `int main()'
0_0_2091883_2837.cpp:3: error: `int main()' previously defined here
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