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53 lines
1.3 KiB
C++
53 lines
1.3 KiB
C++
#define _CRT_SECURE_NO_WARNINGS
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#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
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#include <bits/stdc++.h>
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using namespace std;
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#define CRP(t, x) const t &x
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#define OPL(t, x) bool operator<(CRP(t, x)) const
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#define FIL(x, v) memset(x, v, sizeof(x))
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#define CLR(x) FIL(x, 0)
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#define NE1(x) FIL(x, -1)
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#define INF(x) FIL(x, 0x3f)
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#ifndef _DEBUG
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#define _DEBUG 0
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#endif // !_DEBUG
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#define IFD if (_DEBUG)
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typedef long long ll, i64;
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const int N = 1e5 + 50;
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char s[N];
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int main()
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{
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scanf("%s", s);
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int n = strlen(s), ans = 0;
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list<char> l(s, s + n);
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for (auto ite = l.begin(); ite != l.end();)
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{
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bool flag = true;
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auto ite2 = ite;
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++ite2;
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if (ite2 != l.end() && *ite2 == *ite)
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{
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auto ite3 = ite2;
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++ite3;
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if (ite3 != l.end() && *ite3 == *ite)
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{
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flag = false;
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ans++;
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if (ite == l.begin())
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{
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l.erase(ite, ++ite3);
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ite = l.begin();
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}
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else
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{
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l.erase(ite--, ++ite3);
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if (ite != l.begin()) --ite;
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}
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}
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}
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if (flag && ite != l.end())
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++ite;
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}
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printf("%d", ans);
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return 0;
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} |