Submission #1013031

#	Time	Username	Problem	Language	Result	Execution time	Memory
1013031		aliarapov	Triple Jump (JOI19_jumps)	C++17	0 / 100	33 ms	43196 KiB

jumps

#include <bits/stdc++.h>

#define int long long
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()

using namespace std;

const int INF = 1e9;
const int mod = 998244353;
const int N = 120005;
int sp[N][20];

int get(int l, int r){
	int lg = __lg(r - l + 1);
	return max(sp[l][lg], sp[r - (1ll << lg) + 1][lg]);
}

void solve(){
	int n;
	cin >> n;
	vector<int> a(n);
	for(int i = 0; i < n; i++){
		cin >> a[i];
	}
	for(int i = 0; i < n; i++){
		sp[i][0] = a[i];
	}
	for(int i = 1; i < 20; i++){
		for(int j = 0; j < n; j++){
			sp[j][i] = max(sp[j][i - 1], sp[min(n - 1, j + (1ll << (i - 1)))][i - 1]);
		}
	}
	int q;
	cin >> q;
	while(q--){
		int l, r;
		cin >> l >> r;
		l--;
		r--;
		int mx = get(l, r), pos = l;
		for(int i = l; i <= r; i++){
			if(a[i] == mx){
				pos = i;
				break;
			}
		}
		int ans = 0;
		for(int i = l; i < pos; i++){
			if(i != l) ans = max(ans, a[pos] + a[i] + get(max(l, i - (pos - i)), i - 1));
			
			if(pos + (pos - i) <= r) ans = max(ans, a[pos] + a[i] + get(pos + (pos - i), r));
		}
		for(int i = pos + 1; i < r; i++){
			if(i + (i - pos) <= r) ans = max(ans, a[pos] + a[i] + get(i + (i - pos), r));
			else break;
		}
		
		cout << ans << '\n';
	}
}

main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    int tt = 1;
    //cin >> tt;
    while(tt--){
		solve();
	}
}

Compilation message (stderr)

jumps.cpp:63:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   63 | main(){
      | ^~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 14
• Subtask 3: 0 / 27
• Subtask 4: 0 / 54