12 lines
219 B
C++
12 lines
219 B
C++
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#include <bits/stdc++.h>
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using namespace std;
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int cnt;
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int main() {
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string s;
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cin >> s;
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for (int i = 0; i < s.size(); i++)
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if (s[i] == '1') cnt++;
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printf("%d\n", cnt);
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return 0;
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}
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