Bnuoj-29359 Deal with numbers 线段树

  题目链接:http://www.bnuoj.com/bnuoj/problem_show.php?pid=29359

  题意:一个数列,有三种操作:

    1.区间[a,b]之间大于零的数整出c。

    2.区间[a,b]之间所有的数减去c。

    3.求区间[a,b]的和。

  只要注意到每个数最多除lgn次,总共除n*lgn次,那么直接对除法进行单点更新就可了,关键要分析好复杂度。。

  1 //STATUS:C++_AC_3020MS_33996KB
  2 #include <functional>
  3 #include <algorithm>
  4 #include <iostream>
  5 //#include <ext/rope>
  6 #include <fstream>
  7 #include <sstream>
  8 #include <iomanip>
  9 #include <numeric>
 10 #include <cstring>
 11 #include <cassert>
 12 #include <cstdio>
 13 #include <string>
 14 #include <vector>
 15 #include <bitset>
 16 #include <queue>
 17 #include <stack>
 18 #include <cmath>
 19 #include <ctime>
 20 #include <list>
 21 #include <set>
 22 #include <map>
 23 using namespace std;
 24 //#pragma comment(linker,"/STACK:102400000,102400000")
 25 //using namespace __gnu_cxx;
 26 //define
 27 #define pii pair<int,int>
 28 #define mem(a,b) memset(a,b,sizeof(a))
 29 #define lson l,mid,rt<<1
 30 #define rson mid+1,r,rt<<1|1
 31 #define PI acos(-1.0)
 32 //typedef
 33 typedef long long LL;
 34 typedef unsigned long long ULL;
 35 //const
 36 const int N=500010;
 37 const int INF=0x3f3f3f3f;
 38 const int MOD=100000,STA=8000010;
 39 const LL LNF=1LL<<60;
 40 const double EPS=1e-8;
 41 const double OO=1e15;
 42 const int dx[4]={-1,0,1,0};
 43 const int dy[4]={0,1,0,-1};
 44 const int day[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
 45 //Daily Use ...
 46 inline int sign(double x){return (x>EPS)-(x<-EPS);}
 47 template<class T> T gcd(T a,T b){return b?gcd(b,a%b):a;}
 48 template<class T> T lcm(T a,T b){return a/gcd(a,b)*b;}
 49 template<class T> inline T lcm(T a,T b,T d){return a/d*b;}
 50 template<class T> inline T Min(T a,T b){return a<b?a:b;}
 51 template<class T> inline T Max(T a,T b){return a>b?a:b;}
 52 template<class T> inline T Min(T a,T b,T c){return min(min(a, b),c);}
 53 template<class T> inline T Max(T a,T b,T c){return max(max(a, b),c);}
 54 template<class T> inline T Min(T a,T b,T c,T d){return min(min(a, b),min(c,d));}
 55 template<class T> inline T Max(T a,T b,T c,T d){return max(max(a, b),max(c,d));}
 56 //End
 57 
 58 LL sum[N<<2],miu[N<<2];
 59 int flag[N<<2],num[N];
 60 int T,n,m,a,b,c;
 61 LL ans;
 62 
 63 void pushdown(int l,int r,int rt)
 64 {
 65     if(miu[rt]){
 66         miu[rt<<1]+=miu[rt];
 67         miu[rt<<1|1]+=miu[rt];
 68         sum[rt]+=miu[rt]*(r-l+1);
 69         miu[rt]=0;
 70     }
 71 }
 72 
 73 void pushup(int l,int r,int rt)
 74 {
 75     int mid=(l+r)>>1;
 76     sum[rt]=sum[rt<<1]+(mid-l+1)*miu[rt<<1]
 77         +sum[rt<<1|1]+(r-mid)*miu[rt<<1|1];
 78     flag[rt]=flag[rt<<1]|flag[rt<<1|1];
 79 }
 80 
 81 void build(int l,int r,int rt)
 82 {
 83     miu[rt]=0;
 84     if(l==r){
 85         sum[rt]=num[l];
 86         flag[rt]=num[l]>0;
 87         return;
 88     }
 89     int mid=(l+r)>>1;
 90     build(lson);
 91     build(rson);
 92     sum[rt]=sum[rt<<1]+sum[rt<<1|1];
 93     flag[rt]=flag[rt<<1]|flag[rt<<1|1];
 94 }
 95 
 96 void update1(int l,int r,int rt)
 97 {
 98     if(l==r){
 99         sum[rt]+=miu[rt];
100         miu[rt]=0;
101         sum[rt]=(sum[rt]>0?sum[rt]/=c:sum[rt]);
102         flag[rt]=sum[rt]>0;
103         return;
104     }
105     int mid=(l+r)>>1;
106     pushdown(l,r,rt);
107     if(a<=mid && flag[rt<<1])update1(lson);
108     if(b>mid && flag[rt<<1|1])update1(rson);
109     pushup(l,r,rt);
110 }
111 
112 void update2(int l,int r,int rt)
113 {
114     if(a<=l && r<=b){
115         miu[rt]-=c;
116         return;
117     }
118     int mid=(l+r)>>1;
119     pushdown(l,r,rt);
120     if(a<=mid)update2(lson);
121     if(b>mid)update2(rson);
122     pushup(l,r,rt);
123 }
124 
125 void query(int l,int r,int rt)
126 {
127     if(a<=l && r<=b){
128         ans+=sum[rt]+(r-l+1)*miu[rt];
129         return;
130     }
131     int mid=(l+r)>>1;
132     pushdown(l,r,rt);
133     if(a<=mid)query(lson);
134     if(b>mid)query(rson);
135     pushup(l,r,rt);
136 }
137 
138 int main()
139 {
140  //   freopen("in.txt","r",stdin);
141     int i,j,ca=1;
142     char s[15];
143     scanf("%d",&T);
144     while(T--)
145     {
146         printf("Case %d:\n",ca++);
147         scanf("%d%d",&n,&m);
148         mem(sum,0),mem(miu,0);
149         for(i=1;i<=n;i++){
150             scanf("%d",&num[i]);
151         }
152         build(1,n,1);
153         while(m--){
154             scanf("%s",s);
155             if(s[0]=='D'){
156                 scanf("%d%d%d",&a,&b,&c);
157                 if(c==1)continue;
158                 update1(1,n,1);
159             }
160             else if(s[0]=='M'){
161                 scanf("%d%d%d",&a,&b,&c);
162                 update2(1,n,1);
163             }
164             else {
165                 scanf("%d%d",&a,&b);
166                 ans=0;
167                 query(1,n,1);
168                 printf("%lld\n",ans);
169             }
170         }
171         putchar('\n');
172     }
173     return 0;
174 }

 

posted @ 2013-09-06 00:13  zhsl  阅读(298)  评论(0编辑  收藏  举报