921837_0_0_4805.cpp: In function `int main()':
921837_0_0_4805.cpp:8: error: `sum' undeclared (first use this function)
921837_0_0_4805.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)
921837_0_0_4805.cpp:8: error: expected primary-expression before ';' token
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