Submission #19281393

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
typedef signed long long ll;

#define _P(...) (void)printf(__VA_ARGS__)
#define FOR(x,to) for(x=0;x<(to);x++)
#define FORR(x,arr) for(auto& x:arr)
#define FORR2(x,y,arr) for(auto& [x,y]:arr)
#define ALL(a) (a.begin()),(a.end())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
template<class T> bool chmax(T &a, const T &b) { if(a<b){a=b;return 1;}return 0;}
template<class T> bool chmin(T &a, const T &b) { if(a>b){a=b;return 1;}return 0;}
//-------------------------------------------------------


int N;
int A[202020],B[202020];
int P[202020],RE[202020];
vector<pair<int,int>> R;
int vis[202020];


void goswap(int a,int b) {
	if(A[a]<=B[P[a]]) {
		cout<<-1<<endl;
		exit(0);
	}
	if(A[b]<=B[P[b]]) {
		cout<<-1<<endl;
		exit(0);
	}
	R.push_back({a,b});
	swap(P[a],P[b]);
	RE[P[a]]=a;
	RE[P[b]]=b;
}

void hoge(vector<int> V) {
	vector<pair<int,int>> cand;
	FORR(v,V) cand.push_back({B[v],v});
	sort(ALL(cand));
	reverse(ALL(cand));
	FORR(c,cand) {
		int tar=c.second;
		if(RE[tar]==tar) continue;
		
		goswap(RE[tar],tar);
	}
	
}

void solve() {
	int i,j,k,l,r,x,y; string s;
	
	cin>>N;
	FOR(i,N) cin>>A[i];
	FOR(i,N) cin>>B[i];
	FOR(i,N) {
		cin>>P[i];
		P[i]--;
		RE[P[i]]=i;
	}
	FOR(i,N) if(vis[i]==0) {
		vector<int> V;
		V.push_back(i);
		x=P[i];
		while(x!=i) {
			V.push_back(x);
			x=P[x];
		}
		hoge(V);
	}
	
	cout<<R.size()<<endl;
	FORR(r,R) cout<<r.first+1<<" "<<r.second+1<<endl;
	
	
}


int main(int argc,char** argv){
	string s;int i;
	if(argc==1) ios::sync_with_stdio(false), cin.tie(0);
	FOR(i,argc-1) s+=argv[i+1],s+='\n'; FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
	cout.tie(0); solve(); return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘void solve()’:
./Main.cpp:54:8: warning: unused variable ‘j’ [-Wunused-variable]
   54 |  int i,j,k,l,r,x,y; string s;
      |        ^
./Main.cpp:54:10: warning: unused variable ‘k’ [-Wunused-variable]
   54 |  int i,j,k,l,r,x,y; string s;
      |          ^
./Main.cpp:54:12: warning: unused variable ‘l’ [-Wunused-variable]
   54 |  int i,j,k,l,r,x,y; string s;
      |            ^
./Main.cpp:54:14: warning: unused variable ‘r’ [-Wunused-variable]
   54 |  int i,j,k,l,r,x,y; string s;
      |              ^
./Main.cpp:54:18: warning: unused variable ‘y’ [-Wunused-variable]
   54 |  int i,j,k,l,r,x,y; string s;
      |                  ^
./Main.cpp: In function ‘int main(int, char**)’:
./Main.cpp:6:28: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
    6 | #define FOR(x,to) for(x=0;x<(to);x++)
      |                            ^
./Main.cpp:85:38: note: in expansion of macro ‘FOR’
   85 |  FOR(i,argc-1) s+=argv[i+1],s+='\n'; FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
      |                                      ^~~

Judge Result