foo.cc: In function 'int main()':
foo.cc:102:21: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
                     if(s[i][j] != '_') ++ r ; if(l > r) continue ;
                     ^~
foo.cc:102:47: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
                     if(s[i][j] != '_') ++ r ; if(l > r) continue ;
                                               ^~
foo.cc:134:21: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
                     if(s[i][j] != '_') ++ r ; if(l > r) continue ;
                     ^~
foo.cc:134:47: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
                     if(s[i][j] != '_') ++ r ; if(l > r) continue ;
                                               ^~
foo.cc:93:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%s",s[i] + 1) ;
             ~~~~~^~~~~~~~~~~~~~~

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