이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define all(x) x.begin(), x.end()
#define size(x) (int)x.size()
template<class S, class T>
bool chmin(S &a, const T &b) {
return a > b && (a = b) == b;
}
template<class S, class T>
bool chmax(S &a, const T &b) {
return a < b && (a = b) == b;
}
const int inf = 1e9 + 7;
const int INF = 1e18 + 7;
const int mod = 998244353;
map<int, int> mp;
struct Fenwick {
int n;
vector<int> t;
Fenwick(int n) {
this->n = n;
t.assign(n, -1);
}
void upd(int i, int x) {
for (; i < n; i = i | (i + 1)) {
chmax(t[i], x);
}
}
int get(int i) {
int res = -1;
for (; i >= 0; i = (i & (i + 1)) - 1) {
chmax(res, t[i]);
}
return res;
}
};
signed main() {
cin.tie(nullptr)->sync_with_stdio(false);
int n, res = -1, Max = -1;
cin >> n;
vector<array<int, 3>> v(n);
for (int i = 0; i < n; ++i) {
cin >> v[i][0] >> v[i][1] >> v[i][2];
}
sort(all(v));
vector<int> compress;
for (int i = 0; i < n; ++i) {
if (!mp.count(v[i][1])) {
compress.push_back(v[i][1]);
mp[v[i][1]];
}
if (!mp.count(v[i][2])) {
compress.push_back(v[i][2]);
mp[v[i][2]];
}
}
sort(all(compress));
for (int i = 0; i < size(compress); ++i) {
mp[compress[i]] = i;
}
Fenwick y(size(compress)), z(size(compress));
for (int i = 0; i < n; ++i) {
int j;
for (j = i; j < n && v[i][0] == v[j][0]; j++) {
if (Max != -1) {
chmax(res, Max + v[j][0]);
}
}
for (j = i; j < n && v[i][0] == v[j][0]; j++) {
int Find = y.get(mp[v[j][2]] - 1);
if (Find != -1) {
chmax(Max, v[j][2] + Find);
}
Find = z.get(mp[v[j][1]] - 1);
if (Find != -1) {
chmax(Max, v[j][1] + Find);
}
y.upd(mp[v[j][2]], v[j][1]);
z.upd(mp[v[j][1]], v[j][2]);
}
i = j - 1;
}
cout << res;
}
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