View Compilation Error

0_0_26832455_23960.cpp: In function 'int main()':
0_0_26832455_23960.cpp:51:9: error: redeclaration of 'int i'
     int i=work(0);
         ^
0_0_26832455_23960.cpp:44:13: note: 'int i' previously declared here
     for(int i=1;i<=n;++i)
             ^