Submission #289837

#	Time	Username	Problem	Language	Result	Execution time	Memory
289837		Bill_00	Arranging Shoes (IOI19_shoes)	C++14	Compilation error	0 ms	0 KiB

shoes

#include "shoes.h"
int op[100000],tree[300000];
unordered_map<int,int>p;
vector<int>lft;
void build(int id,int l,int r){
	if(l==r){
		tree[id]=1;
		return;
	}
	build(id*2,l,(l+r)/2);
	build(id*2+1,(l+r)/2+1,r);
	tree[id]=tree[id*2]+tree[id*2+1];
}
long long query(int id,int l,int r,int L,int R){
	if(r<L || R<l){
		return (long long)0;
	}
	if(L<=l && r<=R){
		return (long long)tree[id];
	}
	return query(id*2,l,(l+r)/2,L,R)+query(id*2+1,(l+r)/2+1,r,L,R);
}
void update(int id,int l,int r,int index){
	if(l==r){
		tree[id]=0;
		return;
	}
	if(index<=(l+r)/2){
		update(id*2,l,(l+r)/2,index);
	}
	else update(id*2+1,(l+r)/2+1,r,index);
	tree[id]=tree[id*2]+tree[id*2+1];
}
long long count_swaps(vector<int> s) {
	int n=s.size();
	for(int i=0;i<s.size();i++){
		if(p[-s[i]]!=0){
			op[p[-s[i]]-1]=i;
			p[-s[i]]=0;
		}
		else{
			p[s[i]]=i+1;
			lft.push_back(i);	
		} 
	}
	long long ans=0;
	build(1,0,n-1);
	for(int i=0;i<lft.size();i++){
		int l=lft[i],r=op[lft[i]];
		if(s[l]>0) ans++;
		ans+=(query(1,0,n-1,l,r));
		ans-=2;
		update(1,0,n-1,r);
	}
	return ans;
}

Compilation message (stderr)

shoes.cpp:3:1: error: 'unordered_map' does not name a type
    3 | unordered_map<int,int>p;
      | ^~~~~~~~~~~~~
shoes.cpp:4:1: error: 'vector' does not name a type
    4 | vector<int>lft;
      | ^~~~~~
shoes.cpp:34:23: error: 'long long int count_swaps' redeclared as different kind of entity
   34 | long long count_swaps(vector<int> s) {
      |                       ^~~~~~
In file included from shoes.cpp:1:
shoes.h:7:11: note: previous declaration 'long long int count_swaps(std::vector<int>)'
    7 | long long count_swaps(std::vector<int> S);
      |           ^~~~~~~~~~~
shoes.cpp:34:23: error: 'vector' was not declared in this scope; did you mean 'std::vector'?
   34 | long long count_swaps(vector<int> s) {
      |                       ^~~~~~
      |                       std::vector
In file included from /usr/include/c++/9/vector:67,
                 from shoes.h:5,
                 from shoes.cpp:1:
/usr/include/c++/9/bits/stl_vector.h:386:11: note: 'std::vector' declared here
  386 |     class vector : protected _Vector_base<_Tp, _Alloc>
      |           ^~~~~~
shoes.cpp:34:30: error: expected primary-expression before 'int'
   34 | long long count_swaps(vector<int> s) {
      |                              ^~~