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Horrible Truth.cpp
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Horrible Truth.cpp
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#include <cstdio>
#include <iostream>
#include <algorithm>
#include <set>
#include <bitset>
#include <vector>
#include <sstream>
#include <queue>
#include <fstream>
#include <map>
typedef long long Long;
using namespace std;
inline Long readLong()
{
Long value=0, sign=1;
char ch=getchar();
while(ch<'0'||ch>'9'){if(ch=='-')sign=-1;ch=getchar();}
while(ch>='0'&&ch<='9'){value=value*10+ch-'0';ch=getchar();}
return value*sign;
}
map< pair<int,int> ,int> coordinateMap;
vector<pair<int,int> > coordinateVector;
int main()
{
freopen("horrible.in","r",stdin);
freopen("horrible.out","w",stdout);
int num=readLong();
if(num==1)
{
printf("1\n");
printf("1 0\n");
return 0;
}
coordinateVector.push_back(make_pair(2,-1));
for(int i=1;i<=num;i++)
{
coordinateVector.push_back(make_pair(i,0));
int counter = 0;
int flag = 1;
while(flag)
{
flag=0;
counter++;
if(counter%2==1)
{
flag=0;
for(int inner=1;inner<=num;inner++)
{
if(i==inner)
continue;
if(coordinateMap[make_pair(inner,i)])
continue;
coordinateMap[make_pair(inner,i)]=1;
coordinateVector.push_back(make_pair(inner,i));
flag=1;
break;
}
}
else
{
flag=0;
for(int outer=i+1;outer<=num;outer++)
{
for(int inner=1;inner<=num;inner++)
{
if(inner==outer)
continue;
if(coordinateMap[make_pair(inner,-outer)])
continue;
coordinateMap[make_pair(inner,-outer)]=1;
coordinateVector.push_back(make_pair(inner,-outer));
flag=1;
break;
}
if(flag)
break;
}
}
}
}
printf("%d\n",coordinateVector.size());
for(int i=0;i<coordinateVector.size();i++)
printf("%d %d\n",coordinateVector[i].first,coordinateVector[i].second);
}