Submission #1261117

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Source Code Expand

#define _USE_MATH_DEFINES
#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <complex>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
#include <iterator>
using namespace std;

int main()
{
    int n;
    cin >> n;

    vector<pair<int, int> > v;
    for(int y=1; y<n; y+=2)
        v.push_back(make_pair(0, y));
    for(int x=2-n%2; x<n; x+=2)
        v.push_back(make_pair(x, n-1));
    for(int y=1; y<n-1; y+=3){
        for(int x=1+y%2; x<n; x+=2){
            v.push_back(make_pair(x, y));
        }
    }

    cout << v.size() << endl;
    for(const auto& p : v)
        cout << p.first << ' ' << p.second << endl;

    return 0;
}

Submission Info

Judge Result