#include <bits/stdc++.h>
#define pii pair<int, int>
#define x first
#define y second
using namespace std;
const int N = 1 << 19;
struct item {
int val, sum, mx;
item() : val(-1e9), sum(-1e9), mx(-1e9) {}
item(int val, int sum, int mx) : val(val), sum(sum), mx(mx) {}
friend item operator+(const item &a, const item &b) {
item ret;
ret.val = max(a.val, b.val);
ret.sum = max(a.sum, b.sum);
ret.mx = max({a.mx, b.mx, a.sum + b.val});
return ret;
}
} t[N << 1];
int n, q;
void update(int x, int k, bool f, int p = 1, int l = 1, int r = n) {
if(l == r) {
if(!f) t[p].val = k;
else t[p].sum = k;
if(t[p].val != -1e9 && t[p].sum != -1e9) t[p].mx = t[p].val + t[p].sum;
return;
}
int mid = (l + r) >> 1;
if(x <= mid) update(x, k, f, p << 1, l, mid);
else update(x, k, f, p << 1 | 1, mid + 1, r);
t[p] = t[p << 1] + t[p << 1 | 1];
}
item query(int x, int y, int p = 1, int l = 1, int r = n) {
if(x <= l && r <= y) return t[p];
int mid = (l + r) >> 1;
if(y <= mid) return query(x, y, p << 1, l, mid);
if(x > mid) return query(x, y, p << 1 | 1, mid + 1, r);
return query(x, y, p << 1, l, mid) + query(x, y, p << 1 | 1, mid + 1, r);
}
int A[N], ans[N];
vector<int> relevant[N];
vector<pii> Q[N];
int main() {
scanf("%d", &n);
vector<int> stk;
for(int i = 1; i <= n; i++) {
scanf("%d", A + i);
while(!stk.empty() && A[stk.back()] <= A[i]) {
relevant[stk.back()].emplace_back(i);
stk.pop_back();
}
if(!stk.empty()) relevant[stk.back()].emplace_back(i);
stk.emplace_back(i);
}
for(int i = 1; i <= n; i++) for(int x : relevant[i]) printf("(%d %d) ", i, x);
printf("\n");
scanf("%d", &q);
for(int i = 1, a, b; i <= q; i++) {
scanf("%d %d", &a, &b);
Q[a].emplace_back(b, i);
}
for(int i = n; i; i--) {
update(i, A[i], 0);
for(int x : relevant[i]) if(2 * x - i <= n)
update(2 * x - i, A[i] + A[x], 1);
for(pii p : Q[i]) ans[p.y] = query(i, p.x).mx;
}
for(int i = 1; i <= q; i++) printf("%d\n", ans[i]);
return 0;
}
Compilation message
jumps.cpp: In function 'int main()':
jumps.cpp:52:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d", &n);
~~~~~^~~~~~~~~~
jumps.cpp:55:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d", A + i);
~~~~~^~~~~~~~~~~~~
jumps.cpp:67:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d", &q);
~~~~~^~~~~~~~~~
jumps.cpp:69:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d", &a, &b);
~~~~~^~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
27 ms |
37248 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
27 ms |
37248 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
325 ms |
52216 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
27 ms |
37248 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
