diff options
Diffstat (limited to 'content/datastructures/persistentArray.cpp')
| -rw-r--r-- | content/datastructures/persistentArray.cpp | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/content/datastructures/persistentArray.cpp b/content/datastructures/persistentArray.cpp new file mode 100644 index 0000000..60d8b17 --- /dev/null +++ b/content/datastructures/persistentArray.cpp @@ -0,0 +1,24 @@ +template<typename T>
+struct persistentArray {
+ int time;
+ vector<persistent<T>> data;
+ vector<pair<int, int>> mods;
+
+ persistentArray(int n, T value = {})
+ : time(0), data(n, {time, value}) {}
+
+ T get(int p, int t) {return data[p].get(t);}
+
+ int set(int p, T value) {
+ mods.push_back({p, time});
+ return data[p].set(value);
+ }
+
+ void reset(int t) {
+ while (!mods.empty() && mods.back().second > t) {
+ data[mods.back().first].data.pop_back();
+ mods.pop_back();
+ }
+ time = t;
+ }
+};
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