/in/foo.cc: In function 'int getint()':
/in/foo.cc:39:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     if(w) return -X;return X;
     ^~
/in/foo.cc:39:21: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
     if(w) return -X;return X;
                     ^~~~~~
/in/foo.cc: In function 'bool dfs(int, int, int)':
/in/foo.cc:73:22: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
             int mid=l+r>>1;
                     ~^~
/in/foo.cc:83:22: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
             int mid=l+r>>1;
                     ~^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:104:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         int mid=l+r>>1;
                 ~^~