24 lines
387 B
C++
24 lines
387 B
C++
// Missing Number
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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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bitset<2 * (int)1e5> input;
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int n; cin >> n;
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for (int i{}; i < n; i++) {
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int a; cin >> a;
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input[a-1] = true;
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}
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input = ~input;
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for (int i = 0; i < n; i++) {
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if (input[i]) {
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cout << i + 1<< endl;
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break;
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}
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}
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return 0;
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}
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