View Compilation Error

0_0_2724728_24346.cpp:6: error: size of array `res' is too large
0_0_2724728_24346.cpp: In function `int main()':
0_0_2724728_24346.cpp:16: error: `res' undeclared (first use this function)
0_0_2724728_24346.cpp:16: error: (Each undeclared identifier is reported only once for each function it appears in.)