View Compilation Error

0_0_33547640_32718.cpp: In function 'int main()':
0_0_33547640_32718.cpp:40:37: error: 'i' was not declared in this scope
         for(register int j=0;j<vt[e[i].t].size();++j)
                                     ^
0_0_33547640_32718.cpp:44:17: error: 'flag' was not declared in this scope
                 flag=0;
                 ^
0_0_33547640_32718.cpp:48:12: error: 'flag' was not declared in this scope
         if(flag||vt[e[i].t].size()==0)vt[e[i].t].push_back(e[i]);
            ^
0_0_33547640_32718.cpp:48:23: error: 'i' was not declared in this scope
         if(flag||vt[e[i].t].size()==0)vt[e[i].t].push_back(e[i]);
                       ^