View Compilation Error

0_0_35975821_22883.cpp: In function 'int main()':
0_0_35975821_22883.cpp:76:10: error: redeclaration of 'int a'
      int a = 0;
          ^
0_0_35975821_22883.cpp:70:17: note: 'int a' previously declared here
             int a = id[i];
                 ^
0_0_35975821_22883.cpp:77:6: error: redeclaration of 'int b'
 int  b = 0;
      ^
0_0_35975821_22883.cpp:71:18: note: 'int b' previously declared here
             int  b = id[k];
                  ^