제출 #231053

#제출 시각아이디문제언어결과실행 시간메모리
231053JooDdae역사적 조사 (JOI14_historical)C++17
100 / 100
1653 ms13560 KiB
#include<bits/stdc++.h> using namespace std; using ll = long long; #define mid ((l+r)>>1) const int sq = 400; inline int64_t hilbertOrder(int x, int y, int pow, int rotate) { if (pow == 0) { return 0; } int hpow = 1 << (pow-1); int seg = (x < hpow) ? ( (y < hpow) ? 0 : 3 ) : ( (y < hpow) ? 1 : 2 ); seg = (seg + rotate) & 3; const int rotateDelta[4] = {3, 0, 0, 1}; int nx = x & (x ^ hpow), ny = y & (y ^ hpow); int nrot = (rotate + rotateDelta[seg]) & 3; int64_t subSquareSize = int64_t(1) << (2*pow - 2); int64_t ans = seg * subSquareSize; int64_t add = hilbertOrder(nx, ny, pow-1, nrot); ans += (seg == 1 || seg == 2) ? add : (subSquareSize - add - 1); return ans; } struct query{ int l, r, id; long long order; void init(){ order = hilbertOrder(l, r, 21, 0); } bool operator < (const query &o) const{ return order < o.order; } }q[100100]; int n, m, cnt, k[100100], to[100100]; ll x[100100], tree[400400], ans[100100]; map<ll, int> mp; void init(int node = 1, int l = 1, int r = cnt){ if(l == r){ to[l] = node; return; } init(node*2, l, mid), init(node*2+1, mid+1, r); } void update(int id, ll val){ tree[id] += val; id /= 2; while(id){ tree[id] = max(tree[id*2], tree[id*2+1]); id /= 2; } } int main(){ ios_base::sync_with_stdio(0);cin.tie(0); cin >> n >> m; for(int i=1;i<=n;i++) cin >> x[i], mp[x[i]] = 0; for(auto &x : mp) x.second = ++cnt; init(); for(int i=1;i<=n;i++) k[i] = to[mp[x[i]]]; for(int i=1;i<=m;i++) cin >> q[i].l >> q[i].r, q[i].id = i, q[i].init(); sort(q+1, q+1+m); int l = q[1].l, r = q[1].l-1; for(int i=1;i<=m;i++){ while(l > q[i].l) l--, update(k[l], x[l]); while(r < q[i].r) r++, update(k[r], x[r]); while(l < q[i].l) update(k[l], -x[l]), l++; while(r > q[i].r) update(k[r], -x[r]), r--; ans[q[i].id] = tree[1]; } for(int i=1;i<=m;i++) cout << ans[i] << '\n'; }
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