//Challenge: Accepted
#include <bits/stdc++.h>
using namespace std;
void debug(){cout << endl;}
template<class T, class ... U> void debug(T a, U ... b) {cout << a << " ", debug(b...);}
template<class T> void pary(T l, T r) {
while (l != r) cout << *l << " ", l++;
cout << endl;
}
#define ll long long
#define maxn 200005
#define pii pair<int, int>
#define ff first
#define ss second
#define io ios_base::sync_with_stdio(0);cin.tie(0);
int a[maxn], lef[maxn], rig[maxn], anc[18][maxn], lc[maxn], rc[maxn];
vector<pii> que[maxn];
ll dp[maxn];
struct BIT{
ll bit[maxn];
void modify(int ind, ll val) {
if (ind <= 0) return;
for (;ind < maxn;ind += ind & (-ind))bit[ind] += val;
}
ll query(int ind) {
ll ret = 0;
for (;ind > 0;ind -= ind & (-ind)) ret += bit[ind];
return ret;
}
void rmod(int l, int r, ll val) { //[l, r]
//debug("mod", l, r, val);
modify(r+1, -val);modify(l, val);
}
} b;
void dfs(int n, int par) {
if (lc[n]) dfs(lc[n], n);
if (rc[n]) dfs(rc[n], n);
if (lc[n]) b.rmod(n, rig[n]-1, dp[lc[n]]);
if (rc[n]) b.rmod(lef[n]+1, n, dp[rc[n]]);
dp[n] = b.query(n);
for (auto p:que[n]) {
//debug(n, p.ff, p.ss);
dp[n] = max(dp[n], p.ss + b.query(p.ff));
}
}
int main() {
io
int n;
cin >> n;
for (int i = 1;i <= n;i++) cin >> a[i];
stack<int> stk;
for (int i = 1;i <= n;i++) {
while (stk.size() && a[i] >= a[stk.top()]) {
rig[stk.top()] = i;
stk.pop();
}
lef[i] = (stk.size() ? stk.top() : 0);
stk.push(i);
}
while (stk.size()) {
rig[stk.top()] = n+1;
stk.pop();
}
int root = 0;
for (int i = 1;i <= n;i++) {
int le = 0, ri = 0;
if (lef[i] != 0) le = a[lef[i]];
if (rig[i] != n+1) ri = a[rig[i]];
if (!le && !ri) root = i, anc[0][i] = i;
else if (!le) anc[0][i] = rig[i];
else if (!ri) anc[0][i] = lef[i];
else {
if (le < ri) anc[0][i] = lef[i];
else anc[0][i] = rig[i];
}
if (i != root) {
if (anc[0][i] < i) rc[anc[0][i]] = i;
else lc[anc[0][i]] = i;
}
}
for (int i = 1;i < 18;i++) {
for (int j = 1;j <= n;j++) anc[i][j] = anc[i-1][anc[i-1][j]];
}
int m;
cin >> m;
ll tot = 0;
for (int i = 0;i < m;i++) {
int x, y, c;
cin >> x >> y >> c;
tot += c;
int to = x;
for (int j = 17;j >= 0;j--) {
if (a[anc[j][to]] < y) to = anc[j][to];
}
que[to].push_back({x, c});
//debug(x, y, c, to);
}
dfs(root, 0);
cout << tot - dp[root] << "\n";
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
3 ms |
5196 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
3 ms |
5196 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
3 ms |
5196 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
