View Compilation Error

0_0_27359032_2911.cpp: In function 'int main(int, int)':
0_0_27359032_2911.cpp:7:5: error: expected ')' before '{' token
     {
     ^
0_0_27359032_2911.cpp: In function 'int main()':
0_0_27359032_2911.cpp:20:10: error: conflicting declaration of C function 'int main()'
 int main()
          ^
0_0_27359032_2911.cpp:2:5: note: previous declaration 'int main(int, int)'
 int main(int a,int b)
     ^
0_0_27359032_2911.cpp:29:9: error: expected ';' before '{' token
         {
         ^
0_0_27359032_2911.cpp:29:9: error: expected primary-expression before '{' token
0_0_27359032_2911.cpp:29:9: error: expected ')' before '{' token
0_0_27359032_2911.cpp:31:23: error: 's' was not declared in this scope
             m=s(a[i],m);
                       ^