0_0_2107920_11490.cpp: In function `int main()':
0_0_2107920_11490.cpp:7: error: `r' undeclared (first use this function)
0_0_2107920_11490.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2107920_11490.cpp:15: error: expected primary-expression before "else"
0_0_2107920_11490.cpp:15: error: expected `;' before "else"
0_0_2107920_11490.cpp:16: error: expected primary-expression before "else"
0_0_2107920_11490.cpp:16: error: expected `;' before "else"
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