Merge pull request #1102 from AlgorithmWithGod/khj20006

[20251013] BOJ / P4 / Pilots / 권혁준

Author: ShinHeeEul

khj20006/202510/13 BOJ P4 Pilots.md

@@ -0,0 +1,78 @@
+# segtree
+```cpp
+#pragma GCC optimize("O3, unroll-loops")
+#include <bits/stdc++.h>
+using namespace std;
+
+int T, N, a[3000001]{}, mn[8388608]{}, mx[8388608]{}, ans = 1;
+
+void init(int s, int e, int n) {
+    if(s == e) {
+        mn[n] = mx[n] = a[s];
+        return;
+    }
+    int m = (s+e)>>1;
+    init(s,m,n<<1); init(m+1,e,(n<<1)|1);
+    mn[n] = min(mn[n<<1], mn[(n<<1)|1]);
+    mx[n] = max(mx[n<<1], mx[(n<<1)|1]);
+}
+
+int f(int s, int e, int l, int r, int n) {
+    if(l>r || l>e || r<s) return 2e9;
+    if(l<=s && e<=r) return mn[n];
+    int m = (s+e)>>1;
+    return min(f(s,m,l,r,n<<1), f(m+1,e,l,r,(n<<1)|1));
+}
+
+int g(int s, int e, int l, int r, int n) {
+    if(l>r || l>e || r<s) return 0;
+    if(l<=s && e<=r) return mx[n];
+    int m = (s+e)>>1;
+    return max(g(s,m,l,r,n<<1), g(m+1,e,l,r,(n<<1)|1));
+}
+
+int main(){
+    cin.tie(0)->sync_with_stdio(0);
+    
+    cin>>T>>N;
+    for(int i=1;i<=N;i++) cin>>a[i];
+    init(1,N,1);
+    
+    for(int i=1,j=1;i<=N;i++) {
+        while(j<i && g(1,N,j,i,1) - f(1,N,j,i,1) > T) j++;
+        ans = max(ans, i-j+1);
+    }
+    cout<<ans;
+
+}
+```
+
+# deque
+```cpp
+#include <bits/stdc++.h>
+using namespace std;
+
+int T, N, ans = 1;
+deque<pair<int, int>> mx, mn;
+
+int main(){
+    cin.tie(0)->sync_with_stdio(0);
+    
+    cin>>T>>N;
+    for(int i=1,j=1,a;i<=N;i++) {
+        cin>>a;
+        while(!mn.empty() && mn.back().first > a) mn.pop_back();
+        mn.emplace_back(a,i);
+        while(!mx.empty() && mx.back().first < a) mx.pop_back();
+        mx.emplace_back(a,i);
+        while(j<i && mx.front().first - mn.front().first > T) {
+            j++;
+            while(mx.front().second < j) mx.pop_front();
+            while(mn.front().second < j) mn.pop_front();
+        }
+        ans = max(ans, i-j+1);
+    }
+    cout<<ans;
+
+}
+```