View Compilation Error

0_0_7073872_31550.cpp: In function `long long int bs(long long int, long long int, long long int, long long int)':
0_0_7073872_31550.cpp:13: error: `i' undeclared (first use this function)
0_0_7073872_31550.cpp:13: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7073872_31550.cpp:13: error: expected `)' before "l"
0_0_7073872_31550.cpp:14: error: expected primary-expression before "long"
0_0_7073872_31550.cpp:14: error: expected `;' before "long"
0_0_7073872_31550.cpp:14: error: `s' undeclared (first use this function)