Submission #741897

#	Time	Username	Problem	Language	Result	Execution time	Memory
741897		pavement	Mizuyokan 2 (JOI23_mizuyokan2)	C++17	0 / 100	250 ms	4020 KiB

mizuyokan2

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#define int long long
#define mp make_pair
#define mt make_tuple
#define pb push_back
#define ppb pop_back
#define eb emplace_back
#define g0(a) get<0>(a)
#define g1(a) get<1>(a)
#define g2(a) get<2>(a)
#define g3(a) get<3>(a)
#define g4(a) get<4>(a)
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
using db = double;
using ll = long long;
using ld = long double;
using ii = pair<int, int>;
using iii = tuple<int, int, int>;
using iiii = tuple<int, int, int, int>;
using iiiii = tuple<int, int, int, int, int>;
template<class key, class value = null_type, class cmp = less<key> >
using ordered_set = tree<key, value, cmp, rb_tree_tag, tree_order_statistics_node_update>;

int N, Q, L[250005];

main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cin >> N;
	for (int i = 1; i <= N; i++) {
		cin >> L[i];
	}
	cin >> Q;
	for (int i = 1, X, Y, A, B; i <= Q; i++) {
		cin >> X >> Y >> A >> B;
		L[X] = Y;
		vector<int> C, P;
		for (int j = A + 1; j <= B; j++) {
			C.pb(L[j]);
			//~ cout << L[j] << ' ';
		}
		//~ cout << '\n';
		partial_sum(C.begin(), C.end(), back_inserter(P));
		int ans = 1;
		for (int ed = 0; ed < (int)C.size(); ed++) {
			if (P.back() - P[ed] <= C[ed]) continue;
			int cur = ed, cur_ans = 1;
			//~ cout << "@ " << ed << '\n';
			while (1) {
				for (int to = cur - 2; to >= 0; to--) {
					if (P[cur - 1] - P[to] > max(C[cur], C[to])) {
						cur = to;
						//~ cout << "TO " << to << '\n';
						cur_ans++;
						goto next;
					}
				}
				break;
				next:;
			}
			if (cur == 0 || P[cur - 1] > C[cur]) ans = max(ans, cur_ans * 2 - (cur == 0) + (ed + 1 < (int)C.size()));
		}
		cout << ans << '\n';
	}
}

Compilation message (stderr)

mizuyokan2.cpp:30:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   30 | main() {
      | ^~~~

• Subtask 1: 0 / 6
• Subtask 2: 0 / 9
• Subtask 3: 0 / 13
• Subtask 4: 0 / 32
• Subtask 5: 0 / 29
• Subtask 6: 0 / 11