/in/foo.cc: In function 'int read()':
/in/foo.cc:20:5: 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:20:63: 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 'int main()':
/in/foo.cc:61:7: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
       for(int j = 1; j <= 4; j++)
       ^~~
/in/foo.cc:63:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   it++;
   ^~
/in/foo.cc:59:24: warning: unused variable 'a1' [-Wunused-variable]
     for(int i = n - 2, a1, b1; i; i--){
                        ^~
/in/foo.cc:59:28: warning: unused variable 'b1' [-Wunused-variable]
     for(int i = n - 2, a1, b1; i; i--){
                            ^~
/in/foo.cc:57:8: warning: unused variable 'h1' [-Wunused-variable]
     LL h1, h2;// l1, l2;
        ^~
/in/foo.cc:57:12: warning: unused variable 'h2' [-Wunused-variable]
     LL h1, h2;// l1, l2;
            ^~
/in/foo.cc:150:13: warning: 'mini' may be used uninitialized in this function [-Wmaybe-uninitialized]
     cout << mini << endl;
             ^~~~