View Compilation Error

0_0_3223197_30950.cpp: In function `bool isok(int, int)':
0_0_3223197_30950.cpp:22: error: name lookup of `i' changed for new ISO `for' scoping
0_0_3223197_30950.cpp:13: error:   using obsolete binding at `i'
0_0_3223197_30950.cpp: In function `void dfs()':
0_0_3223197_30950.cpp:197: error: name lookup of `i' changed for new ISO `for' scoping
0_0_3223197_30950.cpp:193: error:   using obsolete binding at `i'