Submission #42719092

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
namespace my_std{
	#define ll long long
	#define bl bool
	ll my_pow(ll a,ll b,ll mod){
		ll res=1;
		if(!b) return 1;
		while(b){
			if(b&1) res=(res*a)%mod;
			a=(a*a)%mod;
			b>>=1;
		}
		return res;
	}
	ll qpow(ll a,ll b){
		ll res=1;
		if(!b) return 1;
		while(b){
			if(b&1) res*=a;
			a*=a;
			b>>=1;
		}
		return res;
	}
	#define db double
	#define pf printf
	#define pc putchar
	#define fr(i,x,y) for(register ll i=(x);i<=(y);i++)
	#define pfr(i,x,y) for(register ll i=(x);i>=(y);i--)
	#define go(u) for(ll i=head[u];i;i=e[i].nxt)
	#define enter pc('\n')
	#define space pc(' ')
	#define fir first
	#define sec second
	#define MP make_pair
	#define il inline
	#define inf 8e18
	#define random(x) rand()*rand()%(x)
	#define inv(a,mod) my_pow((a),(mod-2),(mod))
	il ll read(){
		ll sum=0,f=1;
		char ch=0;
		while(!isdigit(ch)){
			if(ch=='-') f=-1;
			ch=getchar();
		}
		while(isdigit(ch)){
			sum=sum*10+(ch^48);
			ch=getchar();
		}
		return sum*f;
	}
	il void write(ll x){
		if(x<0){
			x=-x;
			pc('-');
		}
		if(x>9) write(x/10);
		pc(x%10+'0');
	}
	il void writeln(ll x){
		write(x);
		enter;
	}
	il void writesp(ll x){
		write(x);
		space;
	}
}
using namespace my_std;
vector<pair<ll,ll> > vec;
ll n,p[1010];
void mdf(ll x,ll y){
	vec.push_back(MP(x,y));
	ll tmp1=p[x],tmp2=p[x+1];
	pfr(i,x-1,y+1) p[i+2]=p[i];
	p[y+1]=tmp1;
	p[y+2]=tmp2;
}
int main(){
	n=read();
	fr(i,1,n) p[i]=read();
	fr(i,1,n-2){
		ll pos=0;
		fr(j,1,n) if(p[j]==i) pos=j;
		if(pos==i) continue;
		if(pos==n){
			mdf(n-1,n-3);
			pos=n-1;
		}
		mdf(pos,i-1);
	}
	if(p[n-1]<p[n]){
		pf("Yes\n");
		writeln((ll)vec.size());
		fr(i,0,(ll)vec.size()-1) pf("%lld %lld\n",vec[i].fir,vec[i].sec);
	}
	else pf("No");
}

Submission Info

Compile Error

./Main.cpp: In function ‘void mdf(long long int, long long int)’:
./Main.cpp:77:6: warning: ISO C++17 does not allow ‘register’ storage class specifier [-Wregister]
   77 |  pfr(i,x-1,y+1) p[i+2]=p[i];
      |      ^
./Main.cpp:30:37: note: in definition of macro ‘pfr’
   30 |  #define pfr(i,x,y) for(register ll i=(x);i>=(y);i--)
      |                                     ^
./Main.cpp: In function ‘int main()’:
./Main.cpp:83:5: warning: ISO C++17 does not allow ‘register’ storage class specifier [-Wregister]
   83 |  fr(i,1,n) p[i]=read();
      |     ^
./Main.cpp:29:36: note: in definition of macro ‘fr’
   29 |  #define fr(i,x,y) for(register ll i=(x);i<=(y);i++)
      |                                    ^
./Main.cpp:84:5: warning: ISO C++17 does not allow ‘register’ storage class specifier [-Wregister]
   84 |  fr(i,1,n-2){
      |     ^
./Main.cpp:29:36: note: in definition of macro ‘fr’
   29 |  #define fr(i,x,y) for(register ll i=(x);i<=(y);i++)
      |                                    ^
./Main.cpp:86:6: warning: ISO C++17 does not allow ‘register’ storage class specifier [-Wregister]
   86 |   fr(j,1,n) if(p[j]==i) pos=j;
      |      ^
./Main.cpp:29:36: note: in definition of macro ‘fr’
   29 |  #define fr(i,x,y) for(register ll i=(x);i<=(y);i++)
      |                                    ^
./Main.cpp:97:6: warning: ISO C++17 does not allow ‘register’ storage class specifier [-Wregister]
   97 |   fr(i,0,(ll)vec.size()-1) pf("%lld %lld\n",vec[i].fir,vec[i].sec);
      |      ^
./Main.cpp:29:36: note: in definition of macro ‘fr’
   29 |  #define fr(i,x,y) for(register ll i=(x);i<=(y);i++)
      |                                    ^

Judge Result