제출 #1083870

#제출 시각아이디문제언어결과실행 시간메모리
1083870lamlamlamFeast (NOI19_feast)C++14
4 / 100
76 ms104344 KiB
#include <bits/stdc++.h> using namespace std; #define endl '\n' struct node { long long pre_max,pre_min,suf_max,suf_min,best,worst,sum; int l_best,r_best,l_worst,r_worst,r_pre_max,r_pre_min,l_suf_max,l_suf_min,lazy; node operator + (const node &o) const { node res; res.sum = sum + o.sum; res.pre_max = max(pre_max,sum+o.pre_max); if(res.pre_max == pre_max) res.r_pre_max = r_pre_max; else res.r_pre_max = o.r_pre_max; res.pre_min = min(pre_min,sum+o.pre_min); if(res.pre_min == pre_min) res.r_pre_min = r_pre_min; else res.r_pre_min = o.r_pre_min; res.suf_max = max(o.sum+suf_max,o.suf_max); if(res.suf_max == o.sum+suf_max) res.l_suf_max = l_suf_max; else res.l_suf_max = o.l_suf_max; res.suf_min = min(o.sum+suf_min,o.suf_min); if(res.suf_min == o.sum+suf_min) res.l_suf_min = l_suf_min; else res.l_suf_min = o.l_suf_min; res.best = max({best,o.best,suf_max+o.pre_max}); if(res.best == best){ res.l_best = l_best; res.r_best = r_best; } else if(res.best == o.best){ res.l_best = o.l_best; res.r_best = o.r_best; } else{ res.l_best = l_suf_max; res.r_best = o.r_pre_max; } res.worst = min({worst,o.worst,suf_min+o.pre_min}); if(res.worst == worst){ res.l_worst = l_worst; res.r_worst = r_worst; } else if(res.worst == o.worst){ res.l_worst = o.l_worst; res.r_worst = o.r_worst; } else{ res.l_worst = l_suf_min; res.r_worst = o.r_pre_min; } return res; } }; node rev(node x) { x.pre_max = -x.pre_max; x.pre_min = -x.pre_min; x.suf_max = -x.suf_max; x.suf_min = -x.suf_min; x.best = -x.best; x.worst = -x.worst; x.sum = -x.sum; swap(x.pre_max,x.pre_min); swap(x.suf_max,x.suf_min); swap(x.best,x.worst); swap(x.l_best,x.l_worst); swap(x.r_best,x.r_worst); swap(x.r_pre_max,x.r_pre_min); swap(x.l_suf_max,x.l_suf_min); return x; } const int MN = 3e5+5; const long long inf = 1e18; int n,k,a[MN]; long long ans; node st[MN*4]; void fix(int v,int l,int r) { if(st[v].lazy%2==0) return; st[v] = rev(st[v]); st[v].lazy = 0; if(l==r) return; st[v*2].lazy++; st[v*2+1].lazy++; } void build(int v,int l,int r) { if(l==r){ st[v].pre_max = st[v].pre_min = st[v].suf_max = st[v].suf_min = st[v].best = st[v].worst = st[v].sum = a[l]; st[v].l_best = st[v].r_best = st[v].l_worst = st[v].r_worst = st[v].r_pre_max = st[v].r_pre_min = st[v].l_suf_max = st[v].l_suf_min = l; return; } int mid = (l+r) >> 1; build(v*2,l,mid); build(v*2+1,mid+1,r); st[v] = st[v*2] + st[v*2+1]; } void upd(int v,int l,int r,int x,int y) { fix(v,l,r); if(x>r or y<l) return; if(x<=l and r<=y){ ans += st[v].sum; st[v].lazy++; fix(v,l,r); return; } int mid = (l+r) >> 1; upd(v*2,l,mid,x,y); upd(v*2+1,mid+1,r,x,y); st[v] = st[v*2] + st[v*2+1]; } signed main() { ios_base::sync_with_stdio(false); cin.tie(NULL); cin >> n >> k; for(int i=1; i<=n; i++) cin >> a[i]; build(1,1,n); while(k--){ fix(1,1,n); int l = st[1].l_best; int r = st[1].r_best; //cout << l << ' ' << r << ' ' << st[1].best << ' ' << st[1].worst << endl; if(st[1].best<=0) break; upd(1,1,n,l,r); } cout << ans; cerr << "\nTime: " << clock(); }
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