/in/foo.cc: In function 'void del(int, int, int&, int)':
/in/foo.cc:8:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     if(!o)o=++cnt;++dp[o];
     ^~
/in/foo.cc:8:19: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
     if(!o)o=++cnt;++dp[o];
                   ^~
/in/foo.cc:9:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     if(l==r)return;int mid=l+r>>1;
     ^~
/in/foo.cc:9:20: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
     if(l==r)return;int mid=l+r>>1;
                    ^~~
/in/foo.cc:9:29: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     if(l==r)return;int mid=l+r>>1;
                            ~^~
/in/foo.cc: In function 'int kth(int, int, int, int)':
/in/foo.cc:15:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid=l+r>>1,tmp=mid-l+1-dp[ls[o]];
             ~^~