/in/foo.cc: In function 'int read()':
/in/foo.cc:37:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for (; c >= '0' && c <= '9'; x = x * 10 + c - '0', c = NC()); x *= minus;
     ^~~
/in/foo.cc:37:67: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
     for (; c >= '0' && c <= '9'; x = x * 10 + c - '0', c = NC()); x *= minus;
                                                                   ^
/in/foo.cc: In function 'double Check1(float)':
/in/foo.cc:91:34: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
         while(temp = Dfs(S, 32000)){
                                  ^
/in/foo.cc:88:25: warning: unused variable 's' [-Wunused-variable]
     double res = 0; int s = 0;
                         ^