#include "elephants.h"
#include <bits/stdc++.h>
using namespace std;
const int mxN = 150007;
const int SZ = 388;
int n, l, step, pos[mxN], bkt[mxN], to[mxN], cnt[mxN], sz[SZ];
set<pair<int,int>> st;
vector<pair<int,int>> arr[mxN];
void fix(int b) {
for (int i = arr[b].size()-1; i >= 0; --i) {
int val = arr[b][i].first + l;
if (val >= arr[b][i].back().first) {
to[arr[b][i].second] = val;
cnt[arr[b][i].second] = 1;
}
else {
auto it = upper_bound(arr[b].begin(), arr[b].end(),
make_pair(val,INT_MAX));
to[arr[b][i].second] = to[(*it).second];
cnt[arr[b][i].second] = cnt[(*it).second] + 1;
}
}
}
void construct() {
for (int i = 0; i < SZ; ++i) {
arr[i].clear();
}
auto it = st.begin();
for (int i = 0; i < n; ++i) {
bkt[(*it).second] = i/SZ;
arr[i/SZ].push_back(*it);
advance(it, 1);
}
for (int b = 0; b < SZ; ++b) {
fix(b);
}
}
void init(int N, int L, int X[]) {
n = N, l = L;
for (int i = 0; i < n; ++i) {
pos[i] = X[i];
st.insert({pos[i], i});
}
construct();
}
int update(int i, int y) {
for (int j = 0; j < arr[bkt[i]].size(); ++j) {
if (arr[bkt[i]][j].second == i) {
arr[bkt[i]].erase(arr[bkt[i]].begin() + j);
break;
}
}
st.erase({pos[i], i});
fix(bkt[i]);
for (int b = 0; b < SZ; ++b) {
if (b == SZ-1 || (arr[b].size() && arr[b].back().first > y)) {
bkt[i] = b;
arr[b].push_back({pos[i] = y, i});
sort(arr[b].begin(), arr[b].end());
st.insert({pos[i], i});
fix(b);
break;
}
}
int ans = 0, cur = -1;
for (int b = 0; b < SZ; ++b) {
if (arr[b].size() && arr[b].back().first > cur) {
auto it = upper_bound(arr[b].begin(), arr[b].end(),
make_pair(cur,INT_MAX));
ans += cnt[(*it).second];
cur = to[(*it).second];
}
}
step++;
if (step == SZ) {
construct();
step = 0;
}
return ans;
}
Compilation message
elephants.cpp: In function 'void fix(int)':
elephants.cpp:16:30: error: '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, int> >, std::pair<int, int> >::value_type' {aka 'struct std::pair<int, int>'} has no member named 'back'
16 | if (val >= arr[b][i].back().first) {
| ^~~~
elephants.cpp: In function 'int update(int, int)':
elephants.cpp:60:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
60 | for (int j = 0; j < arr[bkt[i]].size(); ++j) {
| ~~^~~~~~~~~~~~~~~~~~~~
