View Compilation Error

0_0_35882231_22055.cpp: In function 'int main()':
0_0_35882231_22055.cpp:83:71: error: 'i' was not declared in this scope
         for(int i=1;i<=m;i++) scanf("%d%d%d",&x[i],&y[i],&w[i]);add(x[i],y[i],w[i]);
                                                                       ^