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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#573861 | #9313. Make Max | Anndy_bonus | RE | 0ms | 0kb | C++17 | 1.3kb | 2024-09-18 20:08:29 | 2024-09-18 20:08:30 |
answer
#include <bits/stdc++.h>
using LL = long long;
constexpr int N = 2e5 + 10;
int stk[N], top = -1;
int l[N], r[N];
void solve() {
int n;
std::cin >> n;
std::vector<int> a(n + 2);
for (int i = 1; i <= n; i++) {
std::cin >> a[i];
}
top = -1;
stk[++top] = 0;
for (int i = 1; i <= n; i++) {
while (top != 0 && a[stk[top]] <= a[i]) {
top--;
}
l[i] = stk[top];
stk[++top] = i;
}
top = -1;
stk[++top] = n + 1;
for (int i = n; i >= 1; i--) {
while (top != 0 && a[stk[top]] <= a[i]) {
top--;
}
r[i] = stk[top];
stk[++top] = i;
}
std::vector<int> p(n + 1), dp(n + 2);
for (int i = 1; i <= n; i++) {
p[i] = i;
}
dp[0] = dp[n + 1] = -1;
std::sort(p.begin() + 1, p.end(),
[&](int x, int y) { return a[p[x]] > a[p[y]]; });
LL ans = 0;
for (int i = 1; i <= n; i++) {
dp[p[i]] = std::max(dp[l[p[i]]], dp[r[p[i]]]) + 1;
ans += 1LL * dp[p[i]];
}
std::cout << ans << '\n';
}
int main() {
freopen("ans.in", "r", stdin);
freopen("ans.out", "w", stdout);
std::ios::sync_with_stdio(0);
std::cin.tie(0);
int T;
std::cin >> T;
while (T--) {
solve();
}
return 0;
}
Details
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Test #1:
score: 0
Dangerous Syscalls
input:
4 2 1 2 2 2 2 7 1 1 1 2 2 2 2 3 1 2 3