44 lines
653 B
C++
44 lines
653 B
C++
#include <bits/stdc++.h>
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using namespace std;
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using ll = long long;
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void solve()
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{
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int n,t;
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cin >> n >> t;
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string s;
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if (t == 10)
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{
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if(n==1)
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{
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cout<<-1<<endl;
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return;
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}
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s += '1';
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for (int i = 0; i < n - 1; i++)
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{
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s += '0';
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}
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}
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else
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{
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char c=t+'0';
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for (int i = 0; i < n; i++)
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{
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s += c;
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}
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}
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cout << s << endl;
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}
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int main()
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{
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ios_base::sync_with_stdio(false);
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cin.tie(nullptr);
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int TC = 1;
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// cin >> TC;
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// cin.ignore();
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while (TC--)
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solve();
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} |