kuangbin带我飞QAQ 线段树

　　1. HDU1166

　　裸线段树点修改

  1 #include <iostream>
  2 #include <string.h>
  3 #include <cstdio>
  4 #include <queue>
  5 #include <map>
  6 #include <vector>
  7 #include <string>
  8 #include <cstring>
  9 #include <algorithm>
 10 #include <math.h>
 11 
 12 #define SIGMA_SIZE 26
 13 #pragma warning ( disable : 4996 )
 14 
 15 using namespace std;
 16 typedef long long LL;
 17 
 18 inline LL LMax(LL a,LL b)    { return a>b?a:b; }
 19 inline LL LMin(LL a,LL b)    { return a>b?b:a; }
 20 inline int Max(int a,int b) { return a>b?a:b; }
 21 inline int Min(int a,int b) { return a>b?b:a; }
 22 inline int gcd( int a, int b ) { return b==0?a:gcd(b,a%b); }
 23 inline int lcm( int a, int b ) { return a/gcd(a,b)*b; }  //a*b = gcd*lcm
 24 const long long INF = 0x3f3f3f3f3f3f3f3f;
 25 const int inf  = 0x3f3f3f3f;
 26 const int mod  = 7;
 27 const int maxk = 5e4+5;
 28 const int maxn = 5e4+5;
 29 
 30 int N;
 31 int num[maxn];
 32 int sum[maxn<<2];
 33 char str[10];
 34 
 35 void init()
 36 {
 37     memset( num, 0, sizeof(num) );
 38     memset( sum, 0, sizeof(sum) );
 39 }
 40 
 41 void pushup( int rt )
 42 { sum[rt] = sum[rt<<1]+sum[rt<<1|1]; }
 43 
 44 void build( int l, int r, int rt )
 45 {
 46     if ( l == r )
 47         { sum[rt] = num[l]; return; }
 48     int m = (l+r)>>1;
 49 
 50     build( l, m, rt<<1 );
 51     build( m+1, r, rt<<1|1 );
 52     pushup(rt);
 53 }
 54 
 55 void update(int L, int C, int l, int r, int rt)
 56 { 
 57     if( l == r )
 58         { sum[rt]+=C; return; }  
 59 
 60     int m=(l+r)>>1;   
 61 
 62     if(L <= m) 
 63         update( L, C, l, m, rt<<1 );  
 64     else       
 65         update( L, C, m+1, r, rt<<1|1 );  
 66     pushup(rt);
 67 }   
 68 
 69 int query( int L, int R, int l, int r, int rt )
 70 {
 71     if ( L <= l && R >= r )
 72         return sum[rt];
 73     
 74     int m = (l+r)>>1;
 75 
 76     int Ans = 0;
 77     if ( L <= m ) Ans += query( L, R, l, m, rt<<1 );
 78     if ( R > m ) Ans += query( L, R, m+1, r, rt<<1|1 );
 79     return Ans;
 80 }
 81 
 82 int main()
 83 {
 84     int T; cin >> T;
 85     int cnt = 1;
 86     while (T--)
 87     {
 88         init();
 89         scanf("%d", &N);
 90         for ( int i = 1; i <= N; i++ )
 91             scanf( "%d", &num[i] );
 92 
 93         build( 1, N, 1 );
 94         printf( "Case %d:\n", cnt++ );
 95 
 96         int x, w;
 97         while (1)
 98         {
 99             scanf( "%s", str );
100             if ( str[0] == 'E' )
101                 break;
102 
103             scanf( "%d %d", &x, &w );
104             if ( str[0] == 'A' )
105                 update( x, w, 1, N, 1 );
106             else if ( str[0] == 'S' )
107                 update( x, -w, 1, N, 1 );
108             else if ( str[0] == 'Q' )
109                 printf( "%d\n", query(x,w,1,N,1) );
110         }
111     }
112     return 0;
113 }

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