Submission #19016702

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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 X[101010],Y[101010];

set<int> R[6],C[6];
int A[6];

void GoR(int id,int num) {
	if(R[id].count(num)) {
		R[id].erase(num);
	}
	else {
		R[id].insert(num);
	}
}
void GoC(int id,int num) {
	if(C[id].count(num)) {
		C[id].erase(num);
	}
	else {
		C[id].insert(num);
	}
}
void GoA(int id) {
	A[id]^=1;
}

void solve() {
	int i,j,k,l,r,x,y; string s;
	
	cin>>N;
	FOR(i,N) {
		cin>>X[i]>>Y[i];
		X[i]--,Y[i]--;
		int id=(X[i]%2)*3+Y[i]%3;
		X[i]/=2;
		Y[i]/=3;
		if(X[i]==0&&Y[i]==0) {
			GoA(id);
		}
		else if(Y[i]==0) {
			GoR(id,X[i]);
		}
		else if(X[i]==0) {
			GoC(id,Y[i]);
		}
		else {
			GoR(id,X[i]);
			GoC(id,Y[i]);
			GoA(id);
		}
	}
	
	FOR(i,3) {
		vector<int> D;
		FORR(r,C[i]) if(C[i+3].count(r)) D.push_back(r);
		FORR(d,D) {
			A[i]^=1;
			A[i+3]^=1;
			C[i].erase(d);
			C[i+3].erase(d);
		}
	}
	FOR(i,6) {
		x=i/3*3;
		vector<int> D;
		FORR(r,R[i]) {
			y=R[x].count(r)+R[x+1].count(r)+R[x+2].count(r);
			if(y>=2) D.push_back(r);
		}
		FORR(d,D) {
			A[x]^=1;
			A[x+1]^=1;
			A[x+2]^=1;
			GoR(x,d);
			GoR(x+1,d);
			GoR(x+2,d);
		}
		
	}
	
	
	int ret=0;
	FOR(i,6) {
		x=R[i].size();
		y=C[i].size();
		r=A[i];
		/*
		cout<<i<<x<<y<<" ";
		FORR(r,R[i]) cout<<r;
		cout<<":";
		FORR(r,C[i]) cout<<r;
		cout<<":";
		cout<<r<<endl;
		*/
		k=min(x,y);
		ret+=k;
		x-=k;
		y-=k;
		r^=k%2;
		ret+=x+y;
	}
	x=0;
	FOR(i,6) x+=A[i];
	ret+=min(x,6-x);
	
	
	cout<<ret<<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:43:8: warning: unused variable ‘j’ [-Wunused-variable]
   43 |  int i,j,k,l,r,x,y; string s;
      |        ^
./Main.cpp:43:12: warning: unused variable ‘l’ [-Wunused-variable]
   43 |  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:130:38: note: in expansion of macro ‘FOR’
  130 |  FOR(i,argc-1) s+=argv[i+1],s+='\n'; FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
      |                                      ^~~

Judge Result