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@@ -0,0 +1,29 @@
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+#include<bits/stdc++.h>
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+
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+using namespace std;
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+
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+int main() {
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+ int a[10], k;
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+ for (int i = 0; i < 10; i++) {
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+ cin >> a[i];
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+ }
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+ cin >> k;
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+ int left = 0, right = 9;
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+ bool flag = false;
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+ while (left <= right) {
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+ int mid = (left + right) / 2;
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+ if (a[mid] == k) {
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+ cout << mid << endl;
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+ flag = true;
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+ break;
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+ } else if (k > a[mid]) {
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+ left = mid + 1;
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+ } else {
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+ right = mid - 1;
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+ }
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+ }
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+ if (!flag) {
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+ cout << "Not exist!" << endl;
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+ }
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+ return 0;
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+}
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