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#include "ds/rollback_array.hpp"
#pragma once
template <typename T>
struct Rollback_Array {
int N;
vc<T> dat;
vc<pair<int, T>> history;
Rollback_Array() {}
Rollback_Array(vc<T> x) : N(len(x)), dat(x) {}
Rollback_Array(int N) : N(N), dat(N) {}
template <typename F>
Rollback_Array(int N, F f) : N(N) {
dat.reserve(N);
FOR(i, N) dat.eb(f(i));
}
int time() { return len(history); }
void rollback(int t) {
FOR_R(i, t, time()) {
auto& [idx, v] = history[i];
dat[idx] = v;
}
history.resize(t);
}
T get(int idx) { return dat[idx]; }
void set(int idx, T x) {
history.eb(idx, dat[idx]);
dat[idx] = x;
}
vc<T> get_all() {
vc<T> res(N);
FOR(i, N) res[i] = get(i);
return res;
}
};
#line 2 "ds/rollback_array.hpp"
template <typename T>
struct Rollback_Array {
int N;
vc<T> dat;
vc<pair<int, T>> history;
Rollback_Array() {}
Rollback_Array(vc<T> x) : N(len(x)), dat(x) {}
Rollback_Array(int N) : N(N), dat(N) {}
template <typename F>
Rollback_Array(int N, F f) : N(N) {
dat.reserve(N);
FOR(i, N) dat.eb(f(i));
}
int time() { return len(history); }
void rollback(int t) {
FOR_R(i, t, time()) {
auto& [idx, v] = history[i];
dat[idx] = v;
}
history.resize(t);
}
T get(int idx) { return dat[idx]; }
void set(int idx, T x) {
history.eb(idx, dat[idx]);
dat[idx] = x;
}
vc<T> get_all() {
vc<T> res(N);
FOR(i, N) res[i] = get(i);
return res;
}
};