洛谷 P1319 压缩技术 C/C++

//P1319 压缩技术
//#define LOCAL
#include <iostream>
#include <cstdio>
#include <cstring>
#include <cmath>
#include <algorithm>
#define inf 0x3f3f3f3f
#define eps 1e-6
using namespace std;
#define clr(x) memset(x,0,sizeof((x)))
const int maxn = 5e4+1;//2e6+1
#define MAX(a,b,c) ((a)>(b)?((a)>(c)?(a):(c)):((b)>(c)?(b):(c)))
#define _max(a,b) ((a) > (b) ? (a) : (b))
#define _min(a,b) ((a) < (b) ? (a) : (b))
#define _for(a,b,c) for(int a = b;a<c;a++)
int main() {
    
    
#ifdef LOCAL 
	freopen("data.in","r",stdin);
	freopen("data.out","w",stdout);
#endif
	int i,n,x,fg = 0,tmp = 0;
	cin>>n;
	int buf[maxn];
	clr(buf);
	while(~scanf("%d",&x)) {
    
    
		for(i = tmp;i<tmp+x;i++) {
    
    
			buf[i] = fg;
		}
		fg = !fg;
		tmp+=x;
	}
	for(int i = 0;i<n*n;i++) {
    
    
		cout<<buf[i];
		if((i+1)%n==0)cout<<endl;
	}
	return 0;
}