View Compilation Error

0_0_12273111_18037.cpp: In function `int main()':
0_0_12273111_18037.cpp:11: error: `s' undeclared (first use this function)
0_0_12273111_18037.cpp:11: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12273111_18037.cpp:12: error: `i' undeclared (first use this function)
0_0_12273111_18037.cpp:18: error: `j' undeclared (first use this function)