#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define FOR(i, a, b) for(int i = a; i <= b; i++)
#define FORD(i, a, b) for(int i = a; i >= b; i--)
#define el '\n'
#define BIT(mask, i) (((mask) >> (i)) & 1)
#define MASK(i) (1LL << (i))
#define fi first
#define se second
template <class T1, class T2>
bool minimize(T1 &a, T2 b) {
if(a > b){a = b; return true;} return false;
}
template <class T1, class T2>
bool maximize(T1 &a, T2 b) {
if(a < b){a = b; return true;} return false;
}
const int MAX = 500500;
const ll INF = (ll)1e18 + 10LL;
int n, q;
long long a[MAX];
void init (void) {
cin >> n;
for(int i = 1; i <= n; i++) cin >> a[i];
}
namespace subtask1 {
ll f[111][111];
void solve (void) {
// memset(f, 0x3f, sizeof f);
for(int i = 1; i <= n; i++) for(int j = i + 2; j <= n; j++) {
for(int k = i + 1; k < j; k++) {
if(k - i <= j - k) maximize(f[i][j], a[i] + a[j] + a[k]);
}
}
cin >> q;
for(int i = 1; i <= q; i++) {
int l, r;
cin >> l >> r;
ll ans = 0;
for(int i = l; i <= n; i++) for(int j = i + 2; j <= r; j++) maximize(ans, f[i][j]);
cout << ans << el;
}
}
}
namespace subtask2 {
ll f[5010][5010], max_a[5010][5010], g[5010][5010];
void solve (void) {
for(int i = 1; i <= n; i++) for(int j = i; j <= n; j++) maximize(max_a[i][j], a[j]);
for(int i = 1; i <= n; i++) {
for(int j = i + 2; j <= n; j++){
f[i][j] = max_a[i + 1][(i + j) / 2] + a[i] + a[j];
g[i][j] = max(g[i][j - 1], f[i][j]);
}
}
cin >> q;
for(int i = 1; i <= q; i++) {
int l, r; cin >> l >> r;
ll ans = 0;
for(int i = l; i <= n - 2; i++) maximize(ans, g[i][r]);
cout << ans << el;
}
}
}
namespace subtask3{
ll f[200200], g[200200];
void solve (void) {
ll cur = a[1];
for(int i = 2; i <= n; i++) {
g[i] = a[i] + cur;
maximize(g[i], g[i - 1]);
maximize(cur, a[i]);
}
ll ans = 0;
for(int i = 3; i <= n; i++) {
f[i] = g[(i + 1) / 2] + a[i];
maximize(ans, f[i]);
}
cout << ans << el;
}
}
void solve (void) {
if(n <= 100 && q <= 100) subtask1::solve();
// if(n <= 5000) subtask2::solve();
if(n <= 200000 && q == 1 && l == 1 && r == n) xsubtask3::solve();
}
int main (void) {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
int ntest = 1;
srand(time(0));
while(ntest--) {
init();
solve();
}
return 0;
}
Compilation message
jumps.cpp: In function 'void solve()':
jumps.cpp:105:33: error: 'l' was not declared in this scope
105 | if(n <= 200000 && q == 1 && l == 1 && r == n) xsubtask3::solve();
| ^
jumps.cpp:105:43: error: 'r' was not declared in this scope
105 | if(n <= 200000 && q == 1 && l == 1 && r == n) xsubtask3::solve();
| ^
jumps.cpp:105:51: error: 'xsubtask3' has not been declared
105 | if(n <= 200000 && q == 1 && l == 1 && r == n) xsubtask3::solve();
| ^~~~~~~~~
