#include <bits/stdc++.h>
#include "elephants.h"
using namespace std;
#define all(v) v.begin(), v.end()
typedef long long ll;
const int NMAX = 2e5 + 5;
const int b = 400;
int n, l, m, X[NMAX], q, cnt[b][b * 2 + 5], d[b][b * 2 + 5];
vector<int> v[b];
void init(int n_, int l_, int X_[]){
n = n_; l = l_;
for(int i = 0; i < n; i++) {
X[i] = X_[i];
v[i/b].emplace_back(X[i]);
}
return;
}
void go(int k){
if(v[k].empty()) return;
int sz = v[k].size();
int ii = sz;
for(int i = sz - 1; i >= 0; i--){
auto&x = v[k][i];
while(v[k][ii - 1] - x > l) ii--;
if(ii == sz){
cnt[k][i] = 1;
d[k][i] = x + l;
}
else {
cnt[k][i] = cnt[k][ii] + 1;
d[k][i] = d[k][ii];
}
}
return;
}
void build(){
vector<int> t;
for(int i = 0; i < b; i++){
for(auto& p : v[i]) t.emplace_back(p);
v[i].clear();
}
for(int i = 0; i < n; i++) v[i / b].emplace_back(t[i]);
for(int i = 0; i < b; i++) go(i);
return;
}
int find(int x){
int ret = 0;
for(int i = 0; i < b; i++)
if(v[i].size() && v[i][0] <= x) ret = i;
return ret;
}
int update(int i, int y){
if(q++ % b == 0) build();
int k = find(X[i]);
v[k].erase(lower_bound(all(v[k]), X[i]));
go(k);
X[i] = y;
k = find(X[i]);
auto it = lower_bound(all(v[k]), X[i]);
if(it == v[k].end()) v[k].emplace_back(X[i]);
else v[k].insert(it, X[i]);
go(k);
int ans = 0, e = -1;
for(int i = 0; i < b; i++){
auto it = upper_bound(all(v[i]), e);
if(it != v[i].end()){
int ix = it - v[i].begin();
ans += cnt[k][ix]; e = d[k][ix];
}
}
return ans;
}
/*
int main(void){
ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
cin >> n >> l >> m;
for(int i = 0; i < n; i++) cin >> X[i];
init(n, l, X);
while(m--){
int i, y;
cin >> i >> y;
cout << update(i, y) << '\n';
}
return 0;
}
*/
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
340 KB |
Output is correct |
2 |
Correct |
1 ms |
340 KB |
Output is correct |
3 |
Correct |
1 ms |
340 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
340 KB |
Output is correct |
2 |
Correct |
1 ms |
340 KB |
Output is correct |
3 |
Correct |
1 ms |
340 KB |
Output is correct |
4 |
Correct |
1 ms |
340 KB |
Output is correct |
5 |
Correct |
1 ms |
340 KB |
Output is correct |
6 |
Correct |
1 ms |
340 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
340 KB |
Output is correct |
2 |
Correct |
1 ms |
340 KB |
Output is correct |
3 |
Correct |
1 ms |
340 KB |
Output is correct |
4 |
Correct |
1 ms |
340 KB |
Output is correct |
5 |
Correct |
1 ms |
340 KB |
Output is correct |
6 |
Correct |
1 ms |
340 KB |
Output is correct |
7 |
Incorrect |
15 ms |
1304 KB |
Output isn't correct |
8 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
340 KB |
Output is correct |
2 |
Correct |
1 ms |
340 KB |
Output is correct |
3 |
Correct |
1 ms |
340 KB |
Output is correct |
4 |
Correct |
1 ms |
340 KB |
Output is correct |
5 |
Correct |
1 ms |
340 KB |
Output is correct |
6 |
Correct |
1 ms |
340 KB |
Output is correct |
7 |
Incorrect |
15 ms |
1304 KB |
Output isn't correct |
8 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
340 KB |
Output is correct |
2 |
Correct |
1 ms |
340 KB |
Output is correct |
3 |
Correct |
1 ms |
340 KB |
Output is correct |
4 |
Correct |
1 ms |
340 KB |
Output is correct |
5 |
Correct |
1 ms |
340 KB |
Output is correct |
6 |
Correct |
1 ms |
340 KB |
Output is correct |
7 |
Incorrect |
15 ms |
1304 KB |
Output isn't correct |
8 |
Halted |
0 ms |
0 KB |
- |