View Compilation Error

0_0_16821059_24907.cpp: In function 'int find(int, int)':
0_0_16821059_24907.cpp:16:11: error: 'i' was not declared in this scope
     if (a[i] <= mid) {
           ^
0_0_16821059_24907.cpp:18:5: error: 's' was not declared in this scope
     s += (mid - a[i]) / c[i] + 1;
     ^
0_0_16821059_24907.cpp:21:5: error: 's' was not declared in this scope
     s += (b[i] - a[i]) / c[i] + 1;
     ^