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  • 【BZOJ 1230】 开关灯

    【题目链接】

                https://www.lydsy.com/JudgeOnline/problem.php?id=1230

    【算法】

               线段树

    【代码】

                

    #include<bits/stdc++.h>
    using namespace std;
    #define MAXN 100010
    
    int n,m,l,r,opt;
    
    struct Node
    {
            int l,r,sum;
            bool tag;
    };
    
    class SegmentTree
    {
            private :
                    Node Tree[MAXN<<2];
            public :
                  inline void build(int index,int l,int r)
                  {
                          int mid;
                          Tree[index].l = l; Tree[index].r = r;
                          Tree[index].sum = 0;
                            Tree[index].tag = false;
                          if (l == r) return;
                          mid = (l + r) >> 1;
                          build(index<<1,l,mid);
                          build(index<<1|1,mid+1,r);
                    }
                    inline void update(int index)
                    {
                            Tree[index].sum = Tree[index<<1].sum + Tree[index<<1|1].sum;
                    }
                    inline void pushdown(int index)
                    {
                            int l = Tree[index].l,r = Tree[index].r;
                            int mid = (l + r) >> 1;
                            if (Tree[index].tag)
                            {
                                    Tree[index<<1].sum = mid - l + 1 - Tree[index<<1].sum;
                                    Tree[index<<1|1].sum = r - mid - Tree[index<<1|1].sum;
                                    Tree[index<<1].tag ^= 1;
                                    Tree[index<<1|1].tag ^= 1;
                                    Tree[index].tag = false;
                            }
                    }
                    inline void modify(int index,int l,int r)
                    {
                            int mid;
                            if (Tree[index].l == l && Tree[index].r == r)
                            {
                                    Tree[index].sum = r - l + 1 - Tree[index].sum;
                                    Tree[index].tag ^= 1;
                                    return;
                            } else
                            {
                                    pushdown(index);
                                    mid = (Tree[index].l + Tree[index].r) >> 1;
                                    if (mid >= r) modify(index<<1,l,r);
                                    else if (mid + 1 <= l) modify(index<<1|1,l,r);
                                    else
                                    {
                                            modify(index<<1,l,mid);
                                            modify(index<<1|1,mid+1,r);
                                    } 
                                    update(index);
                            }
                    }
                    inline int query(int index,int l,int r)
                    {
                            int mid;
                            if (Tree[index].l == l && Tree[index].r == r) return Tree[index].sum;
                            else
                            {
                                    pushdown(index);
                                    mid = (Tree[index].l + Tree[index].r) >> 1;
                                    if (mid >= r) return query(index<<1,l,r);
                                    else if (mid + 1 <= l) return query(index<<1|1,l,r);
                                    else return query(index<<1,l,mid) + query(index<<1|1,mid+1,r);
                            }
                    }
    } T;
    
    int main() 
    {
            
            scanf("%d%d",&n,&m);
            T.build(1,1,n);
            while (m--)
            {
                    scanf("%d%d%d",&opt,&l,&r);
                    if (opt == 0) T.modify(1,l,r);
                    else printf("%d
    ",T.query(1,l,r));        
            }
            
            return 0;
        
    }
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  • 原文地址:https://www.cnblogs.com/evenbao/p/9257348.html
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