View Compilation Error

0_0_37875582_28101.cpp: In function 'void solve()':
0_0_37875582_28101.cpp:71:23: error: 'i' was not declared in this scope
             cout<<cal(i-3)+1<<endl;
                       ^
0_0_37875582_28101.cpp:74:5: error: expected '}' before 'else'
     else
     ^