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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. using ll = long long;
  4. #define maxn 50001
  5. int arr[maxn];
  6. #define midpoint(l,r) ((l+r)>>1)
  7. // t
  8.  
  9. ll pre[maxn<<2], suf[maxn<<2], c[maxn<<2];
  10.  
  11. struct segtree {
  12.     int n;
  13.     segtree(int n): n(n) {
  14.         build(0,n-1,1);
  15.     }
  16.     void up(int l,int r,int i) {
  17.         int il = i<<1, ir = i<<1|1;
  18.         pre[i] = max(pre[il],pre[il]+pre[ir]);
  19.         suf[i] = max(suf[ir],suf[il]+suf[ir]);
  20.         c[i] = max({c[il],c[ir],suf[il]+pre[ir]});
  21.     }
  22.     void build(int l,int r,int i) {
  23.         if (l==r) {
  24.             pre[i] = suf[i] = c[i] = arr[l];
  25.             return;
  26.         }
  27.         int mid = midpoint(l,r);
  28.         build(l,mid,i<<1);
  29.         build(mid+1,r,i<<1|1);
  30.         up(l,r,i);
  31.     }
  32.     void set(int idx,int v,int l,int r,int i) {
  33.         if (l==r) {
  34.             pre[i] = suf[i] = c[i] = v;
  35.             return;
  36.         }
  37.         int mid = midpoint(l,r);
  38.         if (idx <= mid) set(idx,v,l,mid,i<<1);
  39.         else set(idx,v,mid+1,r,i<<1|1);
  40.         up(l,r,i);
  41.     }
  42.     // pre, suf, c
  43.     tuple<ll,ll,ll> q(int jl,int jr,int l,int r,int i) {
  44.         if (jl <= l && r <= jr) return {pre[i],suf[i],c[i]};
  45.         int mid = midpoint(l,r);
  46.         if (jr<=mid) return q(jl,jr,l,mid,i<<1);
  47.         if (jl>mid) return q(jl,jr,mid+1,r,i<<1|1);
  48.         auto [prel,sufl,cl] = q(jl,jr,l,mid,i<<1);
  49.         auto [prer,sufr,cr] = q(jl,jr,mid+1,r,i<<1|1);
  50.         return {
  51.             max(prel+prer,prel),
  52.             max(sufr, sufl+sufr),
  53.             max({cl,cr,sufl+prer}),
  54.         };
  55.     }
  56. };
  57. int main() {
  58.     cin.tie(0), ios::sync_with_stdio(0);
  59.  
  60.     int n;
  61.     cin >> n;
  62.     for (int i=0;i<n;i++) cin >> arr[i];
  63.     segtree seg(n);
  64.     int m;
  65.     cin >> m;
  66.     for (int i=0;i<m;i++) {
  67.         int l,r;
  68.         cin >> l >> r, l--, r--;
  69.         cout << get<2>(seg.q(l,r,0,n-1,1)) << '\n';
  70.     }
  71. }
Success #stdin #stdout 0.01s 5920KB
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https://ideone.com/Z7xxzD
problem GSS1, based on SPOJ submission 34960929 (C++ 4.3.2), 2025-08-23 19:11:58
language:
C++ 4.3.2 (gcc-4.3.2)
created:
11 days ago
visibility:
public

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