View Compilation Error

0_0_37748006_3188.cpp: In function 'void dfs(int)':
0_0_37748006_3188.cpp:20:12: error: 'I' was not declared in this scope
   if (a[u][I]&&!vis[i])
            ^
0_0_37748006_3188.cpp: In function 'int main()':
0_0_37748006_3188.cpp:29:25: error: invalid operands of types 'int*' and 'int' to binary 'operator&'
  while(~scanf("%d%d",&n&m)&&n)
                         ^