Submission #270615

#TimeUsernameProblemLanguageResultExecution timeMemory
270615Haunted_CppProgression (NOI20_progression)C++17
35 / 100
479 ms59128 KiB
/** * author: Haunted_Cpp **/ #include <bits/stdc++.h> using namespace std; #pragma GCC optimize("Ofast") #pragma GCC target("fma,sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native") #pragma GCC optimize("unroll-loops") template<typename T> ostream &operator << (ostream &os, const vector<T> &v) { os << '{'; string sep; for (const auto &x : v) os << sep << x, sep = ", "; return os << '}'; } template<typename T, size_t size> ostream &operator << (ostream &os, const array<T, size> &arr) { os << '{'; string sep; for (const auto &x : arr) os << sep << x, sep = ", "; return os << '}'; } template<typename A, typename B> ostream &operator << (ostream &os, const pair<A, B> &p) { return os << '(' << p.first << ", " << p.second << ')'; } void debug_out() { cerr << endl; } template<typename Head, typename... Tail> void debug_out(Head H, Tail... T) { cerr << ' ' << H; debug_out(T...); } #ifdef LOCAL #define debug(...) cerr << "(" << #__VA_ARGS__ << "):", debug_out(__VA_ARGS__) #else #define debug(...) 47 #endif class SegmentTree { private: struct Node { int pre, suf, best; long long delta_pre, delta_suf; int t; Node() { pre = suf = best = 0; delta_pre = delta_suf = 0; t = 0; } void merge(Node l, Node r) { t = l.t + r.t; pre = l.pre; delta_pre = l.delta_pre; suf = r.suf; delta_suf = r.delta_suf; if (l.pre == l.t && l.delta_pre == r.delta_pre) { pre = max(pre, l.pre + r.pre); } if (r.suf == r.t && l.delta_suf == r.delta_suf) { suf = max(suf, l.suf + r.suf); } best = max(l.best, r.best); if (l.delta_suf == r.delta_pre) { best = max(best, l.suf + r.pre); } } }; const int LO, HI; vector<Node> seg; void build(int l, int r, int node, const vector<long long> &arr) { if (l == r) { seg[node].pre = seg[node].suf = seg[node].best = 1; seg[node].delta_pre = arr[l]; seg[node].delta_suf = arr[l]; seg[node].t = 1; return; } const int mid = l + (r - l) / 2; build(l, mid, 2 * node + 1, arr); build(mid + 1, r, 2 * node + 2, arr); seg[node].merge(seg[2 * node + 1], seg[2 * node + 2]); } Node range_query(int ql, int qr, int l, int r, int node) { if (l > qr || r < ql) { Node empty; empty.t = -1; return empty; } if (l >= ql && r <= qr) { return seg[node]; } const int mid = l + (r - l) / 2; Node esq = range_query(ql, qr, l, mid, 2 * node + 1); Node dir = range_query(ql, qr, mid + 1, r, 2 * node + 2); assert( (esq.t == -1 && dir.t == -1) == false); if (esq.t == -1) return dir; if (dir.t == -1) return esq; Node ans; ans.merge(esq, dir); return ans; } public: SegmentTree(const vector<long long> &arr) : LO(0), HI((int)arr.size() - 1) { if (arr.empty()) return; seg.clear(); seg.resize(4 * (int)arr.size()); build(LO, HI, 0, arr); } int range_query(int lo, int hi) { if (lo > hi) return 0; Node ans = range_query(lo, hi, LO, HI, 0); return ans.best; } }; int main() { ios::sync_with_stdio(0); cin.tie(0); int n, q; cin >> n >> q; vector<int> arr(n); for (int i = 0; i < n; i++) { cin >> arr[i]; } vector<long long> diff(n - 1); for (int i = 1; i < n; i++) { diff[i - 1] = arr[i] - arr[i - 1]; } SegmentTree seg(diff); while(q--) { int t, lo, hi; cin >> t >> lo >> hi; --lo; --hi; if (n == 1) { cout << 1 << '\n'; continue; } if (t == 1) { } else if (t == 2) { } else { --hi; cout << seg.range_query(lo, hi) + 1 << '\n'; } } return 0; }
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