제출 #442652

#제출 시각아이디문제언어결과실행 시간메모리
442652zaneyuGrowing Vegetables is Fun 4 (JOI21_ho_t1)C++14
100 / 100
35 ms6332 KiB
/*input 8 12 2 34 85 4 91 29 85 */ #include<bits/stdc++.h> #include <ext/pb_ds/assoc_container.hpp> #include <ext/pb_ds/tree_policy.hpp> using namespace std; using namespace __gnu_pbds; typedef tree<int,null_type,less_equal<int>,rb_tree_tag,tree_order_statistics_node_update> indexed_set; //order_of_key #of elements less than x // find_by_order kth element using ll=long long; using ld=long double; using pii=pair<int,int>; #define f first #define s second #define pb push_back #define REP(i,n) for(int i=0;i<n;i++) #define REP1(i,n) for(int i=1;i<=n;i++) #define FILL(n,x) memset(n,x,sizeof(n)) #define ALL(_a) _a.begin(),_a.end() #define sz(x) (int)x.size() #define SORT_UNIQUE(c) (sort(c.begin(),c.end()),c.resize(distance(c.begin(),unique(c.begin(),c.end())))) const ll INF64=1e18+1; const int INF=0x3f3f3f3f; const int MOD=1e9+9; const ld PI=acos(-1); const ld eps=1e-3; #define lowb(x) x&(-x) #define MNTO(x,y) x=min(x,(__typeof__(x))y) #define MXTO(x,y) x=max(x,(__typeof__(x))y) inline ll mult(ll a,ll b){ if(a>=MOD) a%=MOD; if(b>=MOD) b%=MOD; return (a*b)%MOD; } inline ll mypow(ll a,ll b){ if(b<=0) return 1; ll res=1LL; while(b){ if(b&1) res=mult(res,a); a=mult(a,a); b>>=1; } return res; } const int maxn=2e5+5; const int maxlg=__lg(maxn)+2; ll pref[maxn],suff[maxn]; int32_t main(){ ios::sync_with_stdio(false),cin.tie(0); int n; cin>>n; int pv; cin>>pv; vector<int> v; REP(i,n-1){ int x; cin>>x; v.pb(x-pv); pv=x; } REP1(i,n-1) pref[i]=pref[i-1]+max(-v[i-1]+1,0); for(int i=n-1;i>=1;i--) suff[i]=suff[i+1]+max(v[i-1]+1,0); ll ans=INF64; REP(i,n){ MNTO(ans,max(pref[i],suff[i+1])); } cout<<ans<<'\n'; }
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