Create RMQ-ST-System.cpp

.ACM-Templates/RMQ-ST-System.cpp

@@ -0,0 +1,57 @@
+#include <cstdio>
+#include <cstring>
+#include <cmath>
+#include <algorithm>
+#include <functional>
+#define INF 0x3f3f3f3f
+using namespace std;
+const int maxn = 10010;
+struct node
+{
+    int lt,rt,v;
+};
+node tree[maxn<<2];
+
+/** ========== Conditional =========== */
+using ValueType = int;
+
+inline ValueType algo_delegate(ValueType a,ValueType b)
+{
+    return min(a,b);
+}
+/****************************************/
+
+void build(int lt,int rt,int v)
+{
+    tree[v].lt = lt;
+    tree[v].rt = rt;
+    if(lt == rt)
+    {
+        scanf("%d",&tree[v].v);
+        return;
+    }
+    int mid = (lt + rt)>>1;
+    build(lt,mid,v<<1);
+    build(mid+1,rt,v<<1|1);
+    tree[v].v = algo_delegate(tree[v<<1].v,tree[v<<1|1].v);
+}
+void update(int p,int val,int v)
+{
+    if(tree[v].lt == tree[v].rt)
+    {
+        tree[v].v = val;
+        return;
+    }
+    if(p <= tree[v<<1].rt) update(p,val,v<<1);
+    if(p >= tree[v<<1|1].lt) update(p,val,v<<1|1);
+    tree[v].v = algo_delegate(tree[v<<1].v,tree[v<<1|1].v);
+}
+int query(int lt,int rt,int v)
+{
+    if(tree[v].lt >= lt && tree[v].rt <= rt)
+        return tree[v].v;
+    int a = INF,b = INF;
+    if(lt <= tree[v<<1].rt) a = query(lt,rt,v<<1);
+    if(rt >= tree[v<<1|1].lt) b = query(lt,rt,v<<1|1);
+    return algo_delegate(a,b);
+}