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0_0_3223195_3398.cpp: In function `bool isok(int, int)':
0_0_3223195_3398.cpp:22: error: name lookup of `i' changed for new ISO `for' scoping
0_0_3223195_3398.cpp:13: error:   using obsolete binding at `i'
0_0_3223195_3398.cpp: In function `void dfs()':
0_0_3223195_3398.cpp:197: error: name lookup of `i' changed for new ISO `for' scoping
0_0_3223195_3398.cpp:193: error:   using obsolete binding at `i'