/in/foo.cc: In function 'void dp(int, int)':
/in/foo.cc:111:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(i=0;i<ps[x].size();i++){
           ~^~~~~~~~~~~~~
/in/foo.cc:59:6: warning: unused variable 'mn' [-Wunused-variable]
  int mn=INF,mn1=INF,mn2=INF;
      ^~
/in/foo.cc:59:13: warning: unused variable 'mn1' [-Wunused-variable]
  int mn=INF,mn1=INF,mn2=INF;
             ^~~
/in/foo.cc:59:21: warning: unused variable 'mn2' [-Wunused-variable]
  int mn=INF,mn1=INF,mn2=INF;
                     ^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:134:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int mid=l+r>>1;
           ~^~