Submission #989481

#TimeUsernameProblemLanguageResultExecution timeMemory
989481hahahahaFeast (NOI19_feast)C++17
41 / 100
26 ms7616 KiB
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i<=b; i++) #define FOD(i,a,b) for(int i=a; i>=b; i--) #define fi first #define se second #define pb push_back #define all(x) x.begin(),x.end() #define __sumairu__ main() #define i_love_flandre_scarlet void seggs() #define file(name) if(fopen(name".inp","r")){freopen(name".inp","r",stdin);freopen(name".out","w",stdout);} #define brute(name) if(fopen(name".inp","r")){freopen(name".inp","r",stdin);freopen(name".ans","w",stdout);} #define TIME (1.0*clock()/CLOCKS_PER_SEC) #define FAST ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0); #define ai(n) array<int,n> using namespace std; const int MOD=998244353; //const int MOD=1e9+7; const int inf=1e9; mt19937_64 rd(chrono::steady_clock::now().time_since_epoch().count()); ///check the limits, dummy const int N=2e5+5; int n,k; int a[N]; i64 pre[N]; namespace sub1 { bool check(){return n<=2000&&k<=2000;} i64 t[2003][2003*4]; void up(int c,int id,int l,int r,int p,i64 v) { if(p>r||p<l)return; if(l==r) { t[c][id]=v; return; } int m=(l+r)/2; up(c,id*2,l,m,p,v); up(c,id*2+1,m+1,r,p,v); t[c][id]=max(t[c][id*2],t[c][id*2+1]); } i64 get(int c,int id,int l,int r,int x,int y) { if(x>r||y<l)return -1e18; if(x<=l&&r<=y)return t[c][id]; int m=(l+r)/2; return max(get(c,id*2,l,m,x,y),get(c,id*2+1,m+1,r,x,y)); } void solve() { vector<vector<i64>>dp(n+1,vector<i64>(k+1)); /** dp[i][j]: up to i, picked j segments dp[i][j] = dp[k][j-1]+sum(k+1,i) = ...+t[i]-t[k] (take i)dp[i][j] = t[i] + dp[k][j-1] - t[k] (k<i) (not take i)dp[i][j] = dp[k][j] */ memset(t,-60,sizeof t); i64 ans=0; if(k==1)ans=max(ans,1ll*a[1]); FOR(i,0,n)up(0,1,0,n,i,0-pre[i]); vector<vector<i64>>preMx(k+1,vector<i64>(n+1)); FOR(i,1,n) { FOD(j,min(k,i),1) { dp[i][j]=max(dp[i][j],pre[i]+get(j-1,1,0,n,0,i-1)); dp[i][j]=max(dp[i][j],preMx[j][i-1]); up(j,1,0,n,i,dp[i][j]-pre[i]); preMx[j][i]=max(preMx[j][i-1],dp[i][j]); } ans=max(ans,dp[i][k]); } // FOR(i,1,n) // { // FOR(j,1,k)if(dp[i][j]!=-1e18) // { // cout<<i<<' '<<j<<' '<<dp[i][j]<<'\n'; // } // } cout<<ans; exit(0); } } namespace sub2 { bool check(){return 1;} #define int long long pii dp[N]; pii check(int x) { memset(dp,0,sizeof(dp)); pii ans={}; FOR(i,0,n-1) { pii tmp={dp[i].first-pre[i], dp[i].second}; if(tmp.fi^ans.fi?tmp.fi>ans.fi:tmp.se<ans.se)ans=tmp; pii tmp2={ans.fi-x+pre[i+1],ans.se+1}; dp[i+1]=(tmp2.fi^dp[i].fi?tmp2.fi>dp[i].fi:tmp2.se<dp[i].se)?tmp2:dp[i]; } return dp[n]; } void solve() { int l=0,r=3e14; while(l<r) { int mid=(l+r)/2; if(check(mid).se<=k)r=mid; else l=mid+1; } pii ans=check(l); cout<<ans.fi+k*l; exit(0); } } i_love_flandre_scarlet { cin>>n>>k; FOR(i,1,n) { cin>>a[i]; pre[i]=pre[i-1]+a[i]; } if(*min_element(a+1,a+n+1)>=0) { i64 ans=0; FOR(i,1,n)ans+=a[i]; cout<<ans; return; } int cnt=0; FOR(i,1,n)cnt+=(a[i]<0); if(cnt==1) { i64 L=0,R=0; FOR(i,1,n)if(a[i]<0) { L=pre[i-1]; R=pre[n]-pre[i]; } if(k>=2)cout<<L+R; else cout<<max(L,R); return; } if(sub2::check())sub2::solve(); if(sub1::check())sub1::solve(); } __sumairu__ { FAST //file("ぺぽよ⋆PEPOYO"); // freopen("feas.inp","r",stdin); // freopen("feas.out","w",stdout); int t=1;//cin>>t; while(t--)seggs(); //cerr<<"\nTime elapsed: "<<TIME<<" s.\n"; } /** 6 1 1 -2 3 -1 5 -6 6 2 1 2 3 -10 5 6 6 4 -1 -2 -1 0 -5 -1 */

Compilation message (stderr)

feast.cpp: In function 'std::pair<long long int, long long int> sub2::check(long long int)':
feast.cpp:156:31: warning: 'void* memset(void*, int, size_t)' clearing an object of type 'struct std::pair<long long int, long long int>' with no trivial copy-assignment; use assignment instead [-Wclass-memaccess]
  156 |         memset(dp,0,sizeof(dp));
      |                               ^
In file included from /usr/include/c++/10/bits/stl_algobase.h:64,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from feast.cpp:43:
/usr/include/c++/10/bits/stl_pair.h:211:12: note: 'struct std::pair<long long int, long long int>' declared here
  211 |     struct pair
      |            ^~~~
feast.cpp: At global scope:
feast.cpp:56:21: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   56 | #define __sumairu__ main()
      |                     ^~~~
feast.cpp:222:1: note: in expansion of macro '__sumairu__'
  222 | __sumairu__
      | ^~~~~~~~~~~
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