#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
//#include "temp.cpp"
#include <cstdio>
using namespace std;
#ifndef ONLINE_JUDGE
#define dbg(x) cerr << #x <<" "; print(x); cerr << endl;
#else
#define dbg(x)
#endif
#define sz(x) (int)x.size()
#define len(x) (int)x.length()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define clr(x) (x).clear()
#define uniq(x) x.resize(unique(all(x)) - x.begin());
#define blt __builtin_popcount
#define pb push_back
#define popf pop_front
#define popb pop_back
#define ld long double
#define ll long long
void print(long long t) {cerr << t;}
void print(int t) {cerr << t;}
void print(string t) {cerr << t;}
void print(char t) {cerr << t;}
void print(double t) {cerr << t;}
void print(long double t) {cerr << t;}
void print(unsigned long long t) {cerr << t;}
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
#define nl '\n'
// Indexed Set
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template <class T, class V> void print(pair <T, V> p);
template <class T> void print(vector <T> v);
template <class T> void print(set <T> v);
template <class T, class V> void print(map <T, V> v);
template <class T> void print(multiset <T> v);
template <class T, class V> void print(T v[],V n) {cerr << "["; for(int i = 0; i < n; i++) {print(v[i]); cerr << " "; } cerr << "]";}
template <class T, class V> void print(pair <T, V> p) {cerr << "{"; print(p.first); cerr << ","; print(p.second); cerr << "}";}
template <class T> void print(vector <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
// template <class T> void print(vector <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(set <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(multiset <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(Tree <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void print(map <T, V> v) {cerr << "[ "; for (auto i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(deque <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
// for random generations
mt19937 myrand(chrono::steady_clock::now().time_since_epoch().count());
// mt19937 myrand(131);
// for grid problems
int dx[8] = {-1,0,1,0,1,-1,1,-1};
int dy[8] = {0,1,0,-1,1,1,-1,-1};
// lowest / (1 << 17) >= 1e5 / (1 << 18) >= 2e5 / (1 << 21) >= 1e6
void fastIO() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr); cout.tie(nullptr);
}
// file in/out
void setIO(string str = "") {
fastIO();
if(str == "input") {
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
} else if(str != "") {
freopen((str + ".in").c_str(), "r", stdin);
freopen((str + ".out").c_str(), "w", stdout);
}
}
const int N = 5e5 + 10;
long long dp[5005][5005];
long long mx[5005][5005];
long long a[N];
int n, q;
struct segTreeMax {
vector<long long> mTree;
int size;
void init(long long n) {
size = 1;
while(size < n) {
size *= 2;
}
mTree.assign(2 * size - 1, INT64_MIN);
}
void upd(int u, long long v, int x, int lx, int rx) { // set value at pos u
if(rx - lx == 1) {
mTree[x] = v;
return;
}
int m = (lx + rx) / 2;
if(u < m) {
upd(u, v, 2 * x + 1, lx, m);
}else {
upd(u, v, 2 * x + 2, m, rx);
}
mTree[x] = max(mTree[2 * x + 1], mTree[2 * x + 2]);
}
void upd(int u, long long v) {
upd(u, v, 0, 0, size);
}
long long qry (int l, int r, int x, int lx, int rx) { // range queries
if(l >= rx || lx >= r) {
return INT64_MIN;
}
if(lx >= l && r >= rx) {
return mTree[x];
}
int m = (rx + lx) / 2;
long long s1 = qry(l, r, 2 * x + 1, lx, m);
long long s2 = qry(l, r, 2 * x + 2, m, rx);
return max(s1, s2);
}
long long qry(int l, int r) {
return qry(l, r, 0, 0, size);
}
};
segTreeMax seg;
void solve_() {
cin >> n;
seg.init(n + 4);
for(int i = 1; i <= n; i++) {
cin >> a[i];
seg.upd(i, a[i]);
}
// if(n <= 5000) {
// for(int i = 1; i <= n; i++) {
// long long m = a[i];
// mx[i][i] = a[i];
// for(int j = i; j <= n; j++) {
// m = max(m, a[j]);
// mx[i][j] = m;
// }
// }
// for(int i = 1; i <= n; i++) {
// for(int j = i + 2; j <= n; j++) {
// int c = (i + j) / 2;
// dp[i][j] = a[i] + a[j] + mx[i + 1][c];
// }
// }
// for(int len = 3; len <= n; len++) {
// for(int l = 1; l + len - 1 <= n; l++) {
// int r = l + len - 1;
// dp[l][r] = max(dp[l][r], dp[l + 1][r]);
// dp[l][r] = max(dp[l][r], dp[l][r - 1]);
// }
// }
// cin >> q;
// while(q--) {
// int l, r; cin >> l >> r;
// cout << dp[l][r] << '\n';
// }
// } else {
vector<pair<long long, long long>> vec;
for(int i = 1; i <= n; i++) {
vec.push_back({a[i], i});
}
sort(rall(vec));
int mn = min(30, sz(vec));
long long answ = 0;
vector<long long> loc;
for(int i = 0; i < mn; i++) {
loc.push_back(vec[i].second);
}
for(auto i: loc) {
for(int j = 1; j <= n; j++) {
if(i == j) continue;
if(i > j) {
int c = 2 * j - i;
if(c > i && c <= n) {
answ = max(answ, a[i] + a[j] + seg.qry(c, n + 1));
}
} else {
int aa = 2 * i - j;
if(aa < i) {
answ = max(answ, a[i] + a[j] + seg.qry(max(1, aa), i));
}
}
// intervals
{
int s = i, e = j;
if(s > e) swap(s, e);
if(e - s >= 2) {
int sum = (s + e) / 2;
answ = max(answ, a[i] + a[j] + seg.qry(s + 1, sum + 1));
}
}
}
}
cout << answ << '\n';
// }
}
int main() {
setIO();
auto solve = [&](int test_case)-> void {
for(int i = 1; i <= test_case; i++) {
solve_();
}
};
int test_cases = 1;
// cin >> test_cases;
solve(test_cases);
return 0;
}
Compilation message
jumps.cpp: In function 'void setIO(std::string)':
jumps.cpp:76:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
76 | freopen("input.txt", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
jumps.cpp:77:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
77 | freopen("output.txt", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
jumps.cpp:79:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
79 | freopen((str + ".in").c_str(), "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
jumps.cpp:80:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
80 | freopen((str + ".out").c_str(), "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
340 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
340 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1287 ms |
10228 KB |
Output is correct |
| 2 |
Correct |
974 ms |
10184 KB |
Output is correct |
| 3 |
Correct |
1154 ms |
10144 KB |
Output is correct |
| 4 |
Correct |
1117 ms |
10180 KB |
Output is correct |
| 5 |
Correct |
1117 ms |
10184 KB |
Output is correct |
| 6 |
Correct |
1028 ms |
10200 KB |
Output is correct |
| 7 |
Correct |
1126 ms |
11160 KB |
Output is correct |
| 8 |
Correct |
1110 ms |
11228 KB |
Output is correct |
| 9 |
Correct |
1329 ms |
11476 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
340 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
