#pragma GCC optimize(2) #include<bits/stdc++.h> #define ll long long #define maxn 1000005 #define inf 1e9 #define pb push_back #define rep(i,a,b) for(int i=a;i<=b;i++) #define per(i,a,b) for(int i=a;i>=b;i--) using namespace std; int ans1=0; int ans2=0; int ans3=0; inline int read() { int x=0,w=1; char c=getchar(); while(c<'0'||c>'9') {if(c=='-') w=-1; c=getchar();} while(c<='9'&&c>='0') {x=(x<<1)+(x<<3)+c-'0'; c=getchar();} return w==1?x:-x; } int n; int main() { n=read(); cout<<3*(n+1)+1<<endl; for(int i=0;i<=n+1;i++) printf("%d %d\n",i,i); for(int i=0;i<=n;i++) printf("%d %d\n%d %d\n",i+1,i,i,i+1); return 0; }
Codeforces Global Round 8 C - Even Picture 思维
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