View Compilation Error

0_0_35975814_21686.cpp: In function 'int main()':
0_0_35975814_21686.cpp:75:10: error: redeclaration of 'int a'
      int a = 0, b = 0;
          ^
0_0_35975814_21686.cpp:70:17: note: 'int a' previously declared here
             int a = id[i], b = id[k];
                 ^
0_0_35975814_21686.cpp:75:17: error: redeclaration of 'int b'
      int a = 0, b = 0;
                 ^
0_0_35975814_21686.cpp:70:28: note: 'int b' previously declared here
             int a = id[i], b = id[k];
                            ^