Submission #140195

#	Time	Username	Problem	Language	Result	Execution time	Memory
140195		arman_ferdous	Triple Jump (JOI19_jumps)	C++11	100 / 100	1397 ms	134264 KiB

jumps

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

using ll = long long;
const int N = 5e5+10;
const ll oo = 1e18;

int n;
ll a[N];
deque<pair<int,int>>q;
vector<pair<int,int>> rel;

struct data{
	ll ab, c, sum;
	data(ll x = -oo,ll y = -oo, ll z = -oo) {
		ab = x, c = y, sum = z;
	}
}t[N<<2];

data merge(data L, data R) {
	return data({max(L.ab, R.ab), max(L.c, R.c), max({L.sum, R.sum, L.ab + R.c})});
}

void updAB(int node, int L, int R, int pos, ll x) {
	if(L == R) {
		t[node].ab = max(t[node].ab, x);
		t[node].sum = t[node].ab + t[node].c;
		return;
	} int mid = (L + R) >> 1, lc = node << 1, rc = lc | 1;
	if(pos <= mid) updAB(lc, L, mid, pos, x);
	else updAB(rc, mid + 1, R, pos, x);
	t[node] = merge(t[lc], t[rc]);
}

void updC(int node, int L, int R, int pos, ll x) {
	if(L == R) {
		t[node].c = x;
		t[node].sum = t[node].ab + t[node].c;
		return;
	} int mid = (L + R) >> 1, lc = node << 1, rc = lc | 1;
	if(pos <= mid) updC(lc, L, mid, pos, x);
	else updC(rc, mid + 1, R, pos, x);
	t[node] = merge(t[lc], t[rc]);
}

data get(int node, int L, int R, int l, int r) {
	if(r < L || R < l) return data();
	if(l <= L && R <= r) return t[node];
	int mid = (L + R) >> 1, lc = node << 1, rc = lc | 1;
	data le = get(lc, L, mid, l, r);
	data ri = get(rc, mid + 1, R, l, r);
	return merge(le, ri);
}

vector<pair<int,int>> off[N];
vector<int> candi[N];
ll ans[N];

int main() {
	scanf("%d", &n);
	for(int i = 1; i <= n; i++)
		scanf("%lld", &a[i]);
	q.push_back({INT_MAX, -1});
	for(int i = 1; i <= n; i++) {
		while(q.back().first < a[i]) {
			rel.push_back({q.back().second, i});
			q.pop_back();
		}
		if(q.back().second + 1) rel.push_back({q.back().second, i});
		q.push_back({a[i], i});
	}
	for(auto it : rel) candi[it.first].push_back(it.second);

	int m; scanf("%d", &m);
	for(int i = 0; i < m; i++) {
		int l, r; scanf("%d %d", &l, &r);
		off[l].push_back({r, i});
	}
	for(int i = n; i > 0; i--) {
		updC(1, 1, n, i, a[i]);
		for(auto it : candi[i]) if(2 * it - i <= n) updAB(1, 1, n, 2 * it - i, a[i] + a[it]);
		for(auto qu : off[i]) ans[qu.second] = get(1, 1, n, i, qu.first).sum;
	}
	for(int i = 0; i < m; i++)
		printf("%lld\n", ans[i]);
	return 0;
}

Compilation message (stderr)

jumps.cpp: In function 'int main()':
jumps.cpp:60:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
jumps.cpp:62:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld", &a[i]);
   ~~~~~^~~~~~~~~~~~~~~
jumps.cpp:74:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  int m; scanf("%d", &m);
         ~~~~~^~~~~~~~~~
jumps.cpp:76:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int l, r; scanf("%d %d", &l, &r);
             ~~~~~^~~~~~~~~~~~~~~~~

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