Submission #2152140

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;

#define se second
#define fi first
#define mk(a,b) make_pair(a,b)

int N;
set<pair<int,int> > st;

int main()
{
    scanf("%d",&N);

    for(int i = 1; i < N; i += 3)
    {
        for(int j = 1 - (i % 2); j < N; j += 2)
        {
            st.insert(mk(j,i));
            printf("%d %d\n",j,i);
        }
    }

    for(int i = 0; i < N; i++)
    {
        if(i % 2 == 0)continue;
        if(st.count(mk(0,i)))continue;
        printf("%d %d\n",0,i);
        st.insert(mk(0,i));
    }
    for(int i = 0; i < N; i++)
    {
        if((i + N - 1) % 2 == 0)continue;
        if(st.count(mk(i,N - 1)))continue;
        printf("%d %d\n",i,N - 1);
        st.insert(mk(i,N - 1));
    }
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:13:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&N);
                   ^

Judge Result