Submission #157210

#	Time	Username	Problem	Language	Result	Execution time	Memory
157210		abil	Arranging Shoes (IOI19_shoes)	C++14	Compilation error	0 ms	0 KiB

shoes

#include <bits/stdc++.h>
 
#define fr first
#define sc second
#define pb push_back
#define mk make_pair
#define all(s) s.begin(),s.end()
//#define int long long
 
using namespace std;
 
const int N = (1e5 + 12);
const int mod = (1e9 + 7);
const int INF = (0x3f3f3f3f);

int a[N], minus[N], used[N], t[N * 4];
set<int > s[2][N];
set<int > :: iterator it;
int n;

void update(int pos, int new_val, int v = 1,int tl = 1,int tr = n){
	if(tl == tr){
		t[v] = new_val;
	}
	else{
		int mid = (tl + tr) >> 1;
		if(mid >= pos){
			update(pos, new_val, v + v, tl, mid);
		}
		else{
			update(pos, new_val, v + v + 1, mid + 1, tr);
		}
		t[v] = t[v + v] + t[v + v + 1];
	}
}

int get(int l,int r, int v = 1,int tl = 1,int tr = n){
	if(tl > r || tr < l){
		return 0;
	}
	if(l <= tl && r >= tr){
		return t[v];
	}
	int mid = (tl + tr) >> 1;
	return (get(l, r, v + v, tl, mid) + get(l, r, v + v + 1, mid + 1, tr));
}
main()
{
	cin >> n;
	for(int i = 1;i <= n; i++){
		scanf("%d", &a[i]);
		if(a[i] < 0){
			s[0][abs(a[i])].insert(i);
		}
		else{
			s[1][a[i]].insert(i);
		}
	}
	long long ans = 0, plus = 0;
	for(int i = 1;i <= n; i++){
		if(used[i]){
			continue;
		}
		if(a[i] < 0){
			it = s[1][abs(a[i])].begin();
			s[1][abs(a[i])].erase(s[1][abs(a[i])].begin());
			s[0][abs(a[i])].erase(s[0][abs(a[i])].begin());
			ans += *it - i - 1;
			ans -= get(i, *it);
			update(i, -1);
			update(*it, 1);
			used[*it] = 1;
		}
		else{
			it = s[0][a[i]].begin();
			s[0][a[i]].erase(s[0][a[i]].begin());
			s[1][abs(a[i])].erase(s[1][abs(a[i])].begin());
			ans += *it - i;
			ans -= get(i, i);
			update(i, -1);
			update(*it, 1);
			used[*it] = 1;
		}
	}
	cout << ans;
}
/*
6
-2 2 -2 2 -2 2
*/

Compilation message (stderr)

shoes.cpp:47:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main()
      ^
shoes.cpp: In function 'int main()':
shoes.cpp:59:21: warning: unused variable 'plus' [-Wunused-variable]
  long long ans = 0, plus = 0;
                     ^~~~
shoes.cpp:51:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a[i]);
   ~~~~~^~~~~~~~~~~~~
/tmp/cctNJqEh.o: In function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/ccj87P51.o:shoes.cpp:(.text.startup+0x0): first defined here
/tmp/cctNJqEh.o: In function `main':
grader.cpp:(.text.startup+0x272): undefined reference to `count_swaps(std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status