delete pics to save space

1.3368.cpp

@@ -0,0 +1,49 @@
+// luogu-judger-enable-o2
+#include<cstdio>
+const int maxn=500005;
+inline int lowbit(int x) { return x&-x; }
+int n,m;
+int a[maxn];
+inline void add(int x,int v)
+{
+	while(x<=n)
+	{
+		a[x]+=v;
+		x+=lowbit(x);
+	}
+}
+inline int sum(int x)
+{
+	int res=0;
+	while(x>0)
+	{
+		res+=a[x];
+		x-=lowbit(x);
+	}
+	return res;
+}
+int cmd,x,y,k,last;
+int main()
+{
+	scanf("%d%d",&n,&m);
+	scanf("%d",&last);
+	add(1,last);
+	for(int i=2;i<=n;i++)
+	{
+		scanf("%d",&x);
+		add(i,x-last);
+		last=x;
+	}
+	while(m-->0)
+	{
+		scanf("%d%d",&cmd,&x);
+		if(cmd==1)
+		{
+			scanf("%d%d",&y,&k);
+			add(x,k);
+			add(y+1,-k);
+		}
+		else printf("%d\n",sum(x));
+	}
+	return 0;
+}