/in/foo.cc: In function 'int read()':
/in/foo.cc:22:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for (;isdigit(ch);ch=getchar()) x=x*10+ch-'0'; return x*f;
  ^~~
/in/foo.cc:22:49: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
  for (;isdigit(ch);ch=getchar()) x=x*10+ch-'0'; return x*f;
                                                 ^~~~~~
/in/foo.cc: In function 'void change1(int, int, int, int, int, double, double)':
/in/foo.cc:87:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1;
          ~^~
/in/foo.cc: In function 'void change2(int, int, int, int, int)':
/in/foo.cc:96:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1;
          ~^~