Submission #560273

#	Time	Username	Problem	Language	Result	Execution time	Memory
560273		Koosha_mv	Sorting (IOI15_sorting)	C++14	0 / 100	2 ms	468 KiB

sorting

#include <bits/stdc++.h>
using namespace std;
#define dbgv(v) cout<<#v<<" = "; f(i,0,v.size()) cout<<v[i]<<" "; cout<<endl
#define dbga(a,x,y) cout<<#a<<" = "; f(i,x,y) cout<<a[i]<<" "; cout<<endl
#define erorp(x) cout<<#x<<"={"<<x.F<<" , "<<x.S<<"}"<<endl
#define eror(x) cout<<#x<<'='<<(x)<<endl
#define f_(i,a,b) for(int i=a;i>=b;i--)
#define f(i,a,b) for(int i=a;i<b;i++)
#define nb(x) __builtin_popcount(x)
#define all(v) v.begin(),v.end()
#define bit(n,k) (((n)>>(k))&1)
#define Add(x,y) x=(x+y)%mod
#define maxm(a,b) a=max(a,b)
#define minm(a,b) a=min(a,b)
#define lst(x) x[x.size()-1]
#define sz(x) int(x.size())
#define mp make_pair
#define ll long long
#define pb push_back
#define S second
#define F first
#include "sorting.h"

const int N=2020;

int n,m,a[N],b[N],s[N],t[N],pos[N],mark[N];
vector<pair<int,int>> ans;

int Cnt(){
	fill(mark,mark+N,0);
	int cnt=0;
	f(i,0,n){
		if(mark[i]) continue ;
		cnt++;
		for(int u=i;mark[u]==0;u=b[u]){
			mark[u]=1;
		}
	}
	return cnt;
}
bool check(int x){
	f(i,0,n) b[i]=a[i];
	f(i,0,x+1) swap(b[s[i]],b[t[i]]);
	return n-Cnt()<=x+1;
}
void do_it(){
	fill(mark,mark+N,0);
	ans.clear();
	f(i,0,n){
		if(mark[i]) continue ;
		vector<int> vec;
		for(int u=i;mark[u]==0;u=b[u]){
			mark[u]=1;
			vec.pb(u);
		}
		f(i,1,vec.size()) ans.pb({vec[i-1],vec[i]});
	}
}
int findSwapPairs(int _n, int A[], int _m, int S[], int T[], int P[], int Q[]) {
  n=_n,m=_m;
  f(i,0,m) P[i]=Q[i]=0;
  int cnt=0;
	f(i,0,n){
  	if(mark[i] || a[i]==i) continue ;
  	for(int u=a[i];mark[u]==0;u=a[u]){
  		P[cnt]=i;
  		Q[cnt]=u;
  		cnt++;
			mark[u]=1;
		}
	}
	return m;
	int c=1;
	f(i,0,n){
		a[i]=A[i];
		s[i]=S[i];
		t[i]=T[i];
		if(a[i]!=i) c=0;
	}
	if(c) return 0;
	int l=-1,r=m;
	while(l+1<r){
		int mid=(l+r)>>1;
		if(check(mid)) r=mid;
		else l=mid;
	}
	r=m-1;
	check(r);
	do_it();
	while(ans.size()<r+1) ans.pb({0,0});
	f(i,0,n) pos[a[i]]=i;
	f(i,0,r+1){
		swap(pos[a[s[i]]],pos[a[t[i]]]);
		swap(a[s[i]],a[t[i]]);
		P[i]=pos[ans[i].F];
		Q[i]=pos[ans[i].S];
		swap(pos[a[P[i]]],pos[a[Q[i]]]);
		swap(a[P[i]],a[Q[i]]);
	}
	f(i,0,n) if(a[i]!=i){
		assert(0);
		while(1){
			swap(a[0],a[1]);
		}
	}
	return r+1;
}
/*
int32_t main(){
	srand(time(NULL));
	int n,m,a[100],s[100],t[100],p[100],q[100];
	cin>>n>>m;
	//f(i,0,n) cin>>a[i];
	iota(a,a+n,0); //random_shuffle(a,a+n);
	do{
		f(i,0,m) s[i]=t[i]=0;
		//dbga(a,0,n);
		cout<<findSwapPairs(n,a,m,s,t,p,q)<<"R"<<'\n';
	} while(next_permutation(a,a+n));
}*/

Compilation message (stderr)

sorting.cpp: In function 'void do_it()':
sorting.cpp:56:5: warning: declaration of 'i' shadows a previous local [-Wshadow]
   56 |   f(i,1,vec.size()) ans.pb({vec[i-1],vec[i]});
      |     ^
sorting.cpp:8:26: note: in definition of macro 'f'
    8 | #define f(i,a,b) for(int i=a;i<b;i++)
      |                          ^
sorting.cpp:49:4: note: shadowed declaration is here
   49 |  f(i,0,n){
      |    ^
sorting.cpp:8:26: note: in definition of macro 'f'
    8 | #define f(i,a,b) for(int i=a;i<b;i++)
      |                          ^
sorting.cpp:8:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 | #define f(i,a,b) for(int i=a;i<b;i++)
......
   56 |   f(i,1,vec.size()) ans.pb({vec[i-1],vec[i]});
      |     ~~~~~~~~~~~~~~             
sorting.cpp:56:3: note: in expansion of macro 'f'
   56 |   f(i,1,vec.size()) ans.pb({vec[i-1],vec[i]});
      |   ^
sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:90:18: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   90 |  while(ans.size()<r+1) ans.pb({0,0});
      |        ~~~~~~~~~~^~~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 12
• Subtask 3: 0 / 16
• Subtask 4: 0 / 18
• Subtask 5: 0 / 20
• Subtask 6: 0 / 26