1，3 AC 2，6，9，10 MLE 4，5，7，8 WE 求大佬指点

#include<iostream>
#include<string>

using namespace std;

int main() {
	string a;
	char a_1;
	bool b = false;
	int lmr;
	int lmr_1 = 0;
	cin >> lmr;
	int sum = lmr * lmr;
	int sum_1 = 0;
	for (int i = 0;; i++) {
		cin >> a_1;
		a += a_1;
		sum_1 += (int)a_1 - '0';
		if (sum_1 >= sum)
			break;
	}
	for (int i = 0; i < a.size(); i++) {
		int c = (int)a[i] - '0';
		while (c) {
			if (lmr_1 < lmr) {
				lmr_1++;
				cout << b;
			}
			else {
				cout << endl;
				cout << b;
				lmr_1 = 1;
			}
			c--;
		}
		b = !b;
	}
}