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#include <bits/stdc++.h>
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using namespace std;
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int main() {
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//cin读入优化
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std::ios::sync_with_stdio(false);
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int x, y;
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cin >> x >> y;
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if (x >= -1 && x <= 1 && y >= -1 && y <= 1) {
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cout << "yes";
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} else {
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cout << "no";
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}
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return 0;
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} |
