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#include<bits/stdc++.h>
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using namespace std;
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const int MAXN=1000001;
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//https://blog.csdn.net/weixin_40295575/article/details/79627575
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//program received signal sigsegv<67><76><EFBFBD><EFBFBD>Ҫע<D2AA><D7A2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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// ȷʵ<C8B7><CAB5>ջ<EFBFBD><D5BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>鶨<EFBFBD><E9B6A8><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><D2AA><EFBFBD><EFBFBD><EFBFBD>ں<EFBFBD><DABA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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int a[MAXN];
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int main() {
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int n,i;
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int ans;
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int t;
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cin>>n;
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for(i=1; i<=n; i++)
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cin>>a[i];
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ans=a[1];
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t=ans;
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for(i=2; i<=n; i++) {
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if(t>=0) {
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cout<<"t>=0 before "<<"i="<<i<<" "<<"t="<<t<<" "<<"ans="<<ans<<endl;
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t=t+a[i];
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cout<<"t>=0 end "<<"i="<<i<<" "<<"t="<<t<<" "<<"ans="<<ans<<endl;
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} else {
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cout<<"t<0 before "<<"i="<<i<<" "<<"t="<<t<<" "<<"ans="<<ans<<endl;
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t=a[i];
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cout<<"t<0 end "<<"i="<<i<<" "<<"t="<<t<<" "<<"ans="<<ans<<endl;
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}
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cout<<endl;
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if(t>ans) ans=t;
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}
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cout<<ans;
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return 0;
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}
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