結果
| 問題 |
No.1439 Let's Compare!!!!
|
| コンテスト | |
| ユーザー |
🍮かんプリン
|
| 提出日時 | 2021-03-28 14:42:53 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 477 ms / 2,000 ms |
| コード長 | 3,540 bytes |
| コンパイル時間 | 2,147 ms |
| コンパイル使用メモリ | 177,884 KB |
| 実行使用メモリ | 5,248 KB |
| 最終ジャッジ日時 | 2024-11-29 09:07:02 |
| 合計ジャッジ時間 | 7,330 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 17 |
ソースコード
/**
* @FileName a.cpp
* @Author kanpurin
* @Created 2021.03.28 14:25:55
**/
#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
template < class Monoid >
struct SegmentTree {
private:
using Func = std::function< Monoid(Monoid, Monoid) >;
Func F;
Monoid UNITY;
int n;
std::vector< Monoid > node;
int _binary_search(int a, int b, const std::function<bool(Monoid)> &f, Monoid &s, int k = 0, int l = 0, int r = -1) {
if (r < 0) r = n;
if (r <= a || b <= l) return n;
if (a <= l && r <= b && !f(F(s,node[k]))) {
s = F(s,node[k]);
return n;
}
if (l == r - 1) {s = F(s,node[k]); return l;}
int ret = _binary_search(a, b, f, s, 2 * k + 1, l, (r - l) / 2 + l);
return ret != n ? ret : _binary_search(a, b, f, s, 2 * k + 2, (r - l) / 2 + l, r);
}
public:
SegmentTree() {}
SegmentTree(const std::vector< Monoid > &v, const Func f, const Monoid &unity) {
F = f;
UNITY = unity;
int sz = v.size();
n = 1;
while (n < sz) n <<= 1;
node.resize(n * 2 - 1, UNITY);
for (int i = 0; i < sz; i++) node[i + n - 1] = v[i];
build();
}
SegmentTree(int m, const Monoid &val, const Func f, const Monoid &unity) {
F = f;
UNITY = unity;
n = 1;
while (n < m) n <<= 1;
node.resize(n * 2 - 1, UNITY);
if (val != UNITY) {
for (int i = 0; i < m; i++) node[i + n - 1] = val;
build();
}
}
void set(int k, const Monoid &x) {
node[n + k - 1] = x;
}
void build() {
for (int i = n - 2; i >= 0; i--) node[i] = F(node[2 * i + 1], node[2 * i + 2]);
}
void update_query(int x, const Monoid &val) {
if (x >= n || x < 0) return;
x += n - 1;
node[x] = val;
while (x > 0) {
x = (x - 1) >> 1;
node[x] = F(node[2 * x + 1], node[2 * x + 2]);
}
}
Monoid get_query(int l, int r) {
Monoid L = UNITY, R = UNITY;
if (l < 0) l = 0;
if (r < 0) return UNITY;
if (l >= n) return UNITY;
if (r >= n) r = n;
for (l += n, r += n; l < r; l >>= 1, r >>= 1) {
if (l & 1) L = F(L, node[l++ - 1]);
if (r & 1) R = F(node[--r - 1], R);
}
return F(L, R);
}
int binary_search(int l, int r, const std::function<bool(Monoid)> &f) {
Monoid s = UNITY;
int ret = _binary_search(l,r,f,s);
return ret != n ? ret : -1;
}
Monoid operator[](int x) const {
return node[n + x - 1];
}
int size() {
return n;
}
void print() {
for (int i = 0; i < n; i++) {
std::cout << i << "\t: " << node[n + i - 1] << std::endl;
}
}
};
int main() {
int n;cin >> n;
string s,t;cin >> s >> t;
int q;cin >> q;
vector<bool> a(n);
for (int i = 0; i < n; i++) a[i] = s[i] != t[i];
SegmentTree<bool> seg(a,[](bool a, bool b){return a | b;},false);
while(q--) {
char c; int x,y;cin >> c >> x >> y;
if (c == 'S') s[x-1] = char(y+'0');
else t[x-1] = char(y+'0');
if (s[x-1] == t[x-1]) seg.update_query(x-1,false);
else seg.update_query(x-1,true);
int k = seg.binary_search(0,n,[](bool a){return a;});
if (k == -1) cout << '=' << endl;
else if (s[k] < t[k]) cout << '<' << endl;
else cout << '>' << endl;
}
return 0;
}
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