View Compilation Error

0_0_33882217_4996.cpp:4:1: error: 'usingnamespace' does not name a type
 usingnamespace std;
 ^
0_0_33882217_4996.cpp: In function 'int intmain()':
0_0_33882217_4996.cpp:14:22: error: 'stringtem' was not declared in this scope
                      stringtem="";
                      ^
0_0_33882217_4996.cpp:16:22: error: 'tem' was not declared in this scope
                      tem=tem+str[i]+str[i+1];
                      ^
0_0_33882217_4996.cpp: At global scope:
0_0_33882217_4996.cpp:69:4: error: expected declaration before '}' token
 }  }
    ^