제출 #857144

#제출 시각아이디문제언어결과실행 시간메모리
857144busamateSum Zero (RMI20_sumzero)C++14
61 / 100
871 ms31256 KiB
#include <iostream> #include <set> using namespace std; const int step = 400; long long N, Q, hol, o, tart, a, b; int t[400001]; int apa[400001]; int f[400001]; set<pair<long long, int>> szet; set<int> veg; int solve(int x) { int y = a; if (t[x] < y) { return 0; } int ret = 0; while (f[x] != -1 && y <= t[f[x]]) { ret += step; x = f[x]; } while (x != 0 && y <= t[apa[x]]) { ret++; x = apa[x]; } return ret + 1; } int main() { ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0); cin >> N; for (int i = 1; i <= N; i++) { cin >> t[i]; f[i] = -1; } f[0] = -1; szet.insert({0, -0}); veg.insert(0); int last = 0; for (int i = 1; i <= N; i++) { o += (long long)t[i]; auto it = szet.lower_bound({o, -2 * N}); if (it != szet.end() && (*it).first == o && -(*it).second + 1 > last) { last = -(*it).second + 1; szet.erase(it); auto it2 = veg.lower_bound(last); it2--; apa[i] = (*it2); f[i] = i; for (int cnt = 0; cnt < step; cnt++) { if (f[i] == 0) { f[i] = -1; break; } f[i] = apa[f[i]]; } t[i] = last; veg.insert(i); } szet.insert({o, -i}); } cin >> Q; for (int i = 0; i < Q; i++) { cin >> a >> b; auto it = veg.lower_bound(b + 1); it--; cout << solve((*it)) << '\n'; } return 0; }
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