Submission #567784

#	Time	Username	Problem	Language	Result	Execution time	Memory
567784		maomao90	Team Contest (JOI22_team)	C++17	0 / 100	32 ms	2068 KiB

team

#include <bits/stdc++.h>
using namespace std;

#define REP(i, j, k) for (int i = j; i < k; i++)
#define RREP(i, j, k) for (int i = j; i >= k; i--)

template <class T>
bool mnto(T &a, const T b) {return a > b ? a = b, 1 : 0;}
template <class T>
bool mxto(T &a, const T b) {return a < b ? a = b, 1 : 0;}

typedef long long ll;
#define FI first
#define SE second
typedef pair<int, int> ii;
typedef pair<ll, ll> pll;
typedef tuple<int, int, int> iii;
#define ALL(x) x.begin(), x.end()
#define SZ(x) (int) x.size()
#define pb push_back
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<ll> vll;

#ifndef DEBUG
#define cerr if(0) cerr
#endif

const int MAXN = 150005;
const int INF = 1000000005;
const ll LINF = 1000000000000000005;

int n;
iii xyz[MAXN];
set<ii> st;
ii lft, rht;
int ans;

int main() {
#ifndef DEBUG
	ios::sync_with_stdio(0), cin.tie(0);
#endif
	cin >> n;
	REP (i, 0, n) {
		int x, y, z; cin >> x >> y >> z;
		xyz[i] = {x, y, z};
	}
	sort(xyz, xyz + n, [&] (iii l, iii r) {
			return get<1>(l) < get<1>(r);
			});
	ans = -1;
	int ptr = 0;
	lft = ii{-1, -1}, rht = ii{-1, -1};
	REP (i, 0, n) {
		while (ptr < i && get<1>(xyz[ptr]) < get<1>(xyz[i])) {
			auto [x, y, z] = xyz[ptr++];
			if (lft.FI != -1) {
				if (x > rht.FI && y < lft.SE) {
					rht = ii{x, z};
				} else if (y > lft.SE && x < rht.FI) {
					lft = ii{x, z};
				}
			}
			auto [it, yes] = st.insert(ii{x, z});
			if (!yes) {
				continue;
			}
			//cerr << "+ " << x << ' ' << z << '\n';
			if (next(it) != st.end() && next(it) -> SE >= z) {
				it = st.erase(it);
				//cerr << "- " << x << ' ' << z << '\n';
				assert(next(it) == st.end() || it -> FI != next(it) -> FI);
				assert(it == st.begin() || it -> FI != prev(it) -> FI);
				assert(next(it) == st.end() || it -> SE > next(it) -> SE);
				assert(it == st.begin() || it -> SE < prev(it) -> SE);
				continue;
			}
			while (it != st.begin() && prev(it) -> SE <= z) {
				//cerr << "- " << prev(it) -> FI << ' ' << prev(it) -> SE << '\n';
				st.erase(prev(it));
			}
			assert(next(it) == st.end() || it -> FI != next(it) -> FI);
			assert(it == st.begin() || it -> FI != prev(it) -> FI);
			assert(next(it) == st.end() || it -> SE > next(it) -> SE);
			assert(it == st.begin() || it -> SE < prev(it) -> SE);
			if (SZ(st) >= 2) {
				lft = *st.begin();
				rht = *prev(st.end());
			}
		}
		if (SZ(st) >= 2) {
			int mx = prev(st.end()) -> FI, mz = st.begin() -> SE;
			int my = -INF;
			auto [cx, cy, cz] = xyz[i];
			if (cx < mx && cz < mz) {
				my = cy;
			}
			if (my != -INF) {
				mxto(ans, mx + my + mz);
			}
		}
		if (lft.FI != -1) {
			int mx = rht.FI, mz = lft.SE;
			int my = -INF;
			auto [cx, cy, cz] = xyz[i];
			if (cx < mx && cz < mz) {
				my = cy;
			}
			if (my != -INF) {
				mxto(ans, mx + my + mz);
			}
		}
	}
	cout << ans << '\n';
	return 0;
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 29
• Subtask 3: 0 / 9
• Subtask 4: 0 / 9
• Subtask 5: 0 / 9
• Subtask 6: 0 / 9
• Subtask 7: 0 / 27