結果
| 問題 |
No.151 セグメントフィッシング
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2020-01-29 20:57:18 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 58 ms / 5,000 ms |
| コード長 | 4,378 bytes |
| コンパイル時間 | 1,218 ms |
| コンパイル使用メモリ | 92,484 KB |
| 実行使用メモリ | 5,632 KB |
| 最終ジャッジ日時 | 2024-09-16 02:24:52 |
| 合計ジャッジ時間 | 3,202 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 5 |
| other | AC * 19 |
ソースコード
#include<iostream>
#include<random>
#include<vector>
#include<climits>
using namespace std;
// 0-indexed
template<class T, class F>
struct Treap{
struct Node{
T val, sum;
int pri;
int cnt;
Node* ch[2];
Node(T v, int p) : val(v), sum(v), pri(p){
cnt = 1;
ch[0] = ch[1] = NULL;
}
};
Node* root;
vector<T> v;
F f;
T def;
Treap(T def, F f) : f(f), def(def) {
root = NULL;
}
int count(Node* t) {return t==NULL ? 0 : t->cnt;}
T sum(Node* t) {return t==NULL ? def : t->sum;}
Node* update(Node* t){
t->cnt = count(t->ch[0]) + count(t->ch[1]) + 1;
t->sum = f(sum(t->ch[0]), f(t->val, sum(t->ch[1])));
return t;
}
Node* rotate(Node* t, int b){
Node* s = t->ch[b];
t->ch[b] = s->ch[1-b];
s->ch[1-b] = t;
update(t);
update(s);
return s;
}
Node* insert(Node* t, int k, T val, int pri){
if(t == NULL) return new Node(val, pri);
int leftCnt = count(t->ch[0]);
int b = k > leftCnt;
t->ch[b] = insert(t->ch[b], k-(b ? leftCnt+1 : 0), val, pri);
update(t);
if(t->ch[b]->pri > t->pri) t = rotate(t, b);
return t;
}
Node* erase(Node* t, int k, bool me=false){
if(!me && count(t) <= k) return t; // out-of-range
me |= count(t->ch[0])==k;
if(me){
if(t->ch[0]==NULL && t->ch[1]==NULL){
delete t;
return NULL;
}
int b = (t->ch[0]==NULL ? -1 : t->ch[0]->pri) < (t->ch[1]==NULL ? -1 : t->ch[1]->pri);
t = rotate(t, b);
t->ch[1-b] = erase(t->ch[1-b], k, me);
}else{
if(count(t->ch[0]) > k){
t->ch[0] = erase(t->ch[0], k, me);
}else{ // definitely count(t->ch[0]) < k
t->ch[1] = erase(t->ch[1], k-count(t->ch[0])-1, me);
}
}
return update(t);
}
T get(Node* t, int k){
int leftCnt = count(t->ch[0]);
if(leftCnt > k) return get(t->ch[0], k);
if(leftCnt == k) return t->val;
return get(t->ch[1], k-1-leftCnt);
}
void set(Node* t, int k, T newVal){
if(k < count(t->ch[0])){
set(t->ch[0], k, newVal);
}else if(k == count(t->ch[0])){
t->val = f(t->val, newVal); // !!! //
}else if(k > count(t->ch[0])){
set(t->ch[1], k-count(t->ch[0])-1, newVal);
}
update(t);
}
// a, bはt-oriented
T query(Node* t, int a, int b){
if(t == NULL) return def;
if(a == 0 && count(t) <= b+1) return t->sum;
T ret = def;
int leftCnt = count(t->ch[0]);
if(a < leftCnt) ret = f(ret, query(t->ch[0], a, b));
if(a <= leftCnt && leftCnt <= b) ret = f(ret, t->val);
if(b > leftCnt) ret = f(ret, query(t->ch[1], max(0, a-leftCnt-1), b-leftCnt-1));
return ret;
}
Node* insert(int k, T val){
return root = insert(root, k, val, rand());
}
Node* erase(int k){
return root = erase(root, k);
}
T get(int k){
return get(root, k);
}
void set(int k, T val){
set(root, k, val);
}
T query(int a, int b){
return query(root, a, b);
}
void flatten(Node* t){
if(t==NULL) return;
if(t->ch[0] != NULL) flatten(t->ch[0]);
v.push_back(t->val);
if(t->ch[1] != NULL) flatten(t->ch[1]);
}
vector<T> flatten(){
v.clear();
flatten(root);
return v;
}
};
typedef long long ll;
int main(){
int n, q;
scanf("%d %d\n", &n, &q);
auto f = [](ll x, ll y)->ll{
return x+y;
};
Treap<ll, decltype(f)> l(0, f), r(0, f);
for(int i = 0; i < n; i++) l.insert(i, 0), r.insert(i, 0);
while(q--){
ll lbegin = l.get(0), rend = r.get(n-1);
r.erase(n-1); l.erase(0);
r.insert(0, lbegin);
l.insert(n-1, rend);
char x;
int y, z;
scanf("%c %d %d\n", &x, &y, &z);
if(x == 'L'){
l.set(y, z);
}else if(x == 'R'){
r.set(y, z);
}else if(x == 'C'){
z--;
printf("%lld\n", l.query(y,z)+r.query(y,z));
}
}
return 0;
}