View Compilation Error

0_0_8905578_24844.cpp: In function `int main()':
0_0_8905578_24844.cpp:7: error: `N' undeclared (first use this function)
0_0_8905578_24844.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8905578_24844.cpp:20: error: `end' undeclared (first use this function)