注意對lazy 等標記的清空
區間更新,區間查詢:
struct nodes
node[800040];
int a[200009];
void pushup(int u)
void update(int u,int left,int right,int val);
void pushdown(int n)
}void build (int u,int left,int right)
int mid = (node[u].l + node[u].r)>>1;
build (l(u),left,mid);
build (r(u),mid+1,right);
pushup(u);
}void update(int u,int left,int right,int val)
pushdown(u); //延時更新
int mid = (node[u].l + node[u].r)>>1;
if (right <= mid) update(l(u),left,right,val);
else if (left > mid) update(r(u),left,right,val);
else
pushup(u); //這裡不需要再向上更新,因為我們是從上到下更新的
}long long querysum(int u,int left,int right)
long long querymin(int u,int left,int right)
int main ()
build(1,1,n);
for(int i = 0; i < m; i ++)
if(s[0] == 'm')
if(s[0] == 's')
}return 0;
}
單點更新,區間查詢
struct nodes
node[200200];
int a[50005];
void pushup(int u)
void build (int u,int left,int right)
int mid = (node[u].l + node[u].r)>>1;
build (l(u),left,mid);
build (r(u),mid+1,right);
pushup(u);
}void update(int u,int left,int right,int val)
//if (node[u].add) pushdown(u); //延時更新
int mid = (node[u].l + node[u].r)>>1;
if (right <= mid) update(l(u),left,right,val);
else if (left > mid) update(r(u),left,right,val);
else
pushup(u); //這裡不需要再向上更新,因為我們是從上到下更新的
}int query(int u,int left,int right)
int main ()
build(1,1,n);
while(1)
else if(strcmp(s,"sub") == 0)
else if(strcmp(s,"query" ) == 0)
else}}
return 0;
}
單點更新與區間更新的不同是:單點更新,一次更新到底,不需要lazy標記
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