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31 lines
615 B
C++
31 lines
615 B
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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const int N = 1e6 + 50;
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bool in[N];
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int ans, cnt;
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int main()
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{
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int n;
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scanf("%d", &n);
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while (n--)
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{
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char buf[3];
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int id;
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scanf("%s%d", buf, &id);
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if (*buf == '+')
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{
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in[id] = true;
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ans = max(ans, ++cnt);
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}
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if (*buf == '-')
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{
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if (in[id]) in[id] = false, cnt--;
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else ans++;
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}
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}
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printf("%d", ans);
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return 0;
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}
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