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16 lines
190 B
C++
16 lines
190 B
C++
#include <bits/stdc++.h>
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using namespace std;
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int ans;
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string s;
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int main() {
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cin >> s;
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for (auto c : s) {
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ans += c == '1';
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}
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cout << ans << endl;
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return 0;
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}
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