compile reference failed: exit status 1
# command-line-arguments
./722E.go:96:22: cannot use dr + dc (value of type int) as int64 value in argument to comb
./722E.go:96:29: cannot use dr (variable of type int) as int64 value in argument to comb
./722E.go:102:50: cannot use dr2 + dc2 (value of type int) as int64 value in argument to comb
./722E.go:102:59: cannot use dr2 (variable of type int) as int64 value in argument to comb