【HDU】4092 Nice boat（多校第四场1006） ——线段树 懒惰标记

 

Nice boat

Time Limit: 30000/15000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)
Total Submission(s): 146    Accepted Submission(s): 75

Problem Description

There is an old country and the king fell in love with a devil. The devil always asks the king to do some crazy things. Although the king used to be wise and beloved by his people. Now he is just like a boy in love and can’t refuse any request from the devil. Also, this devil is looking like a very cute Loli.

Let us continue our story, z*p(actually you) defeat the 'MengMengDa' party's leader, and the 'MengMengDa' party dissolved. z*p becomes the most famous guy among the princess's knight party. 

One day, the people in the party find that z*p has died. As what he has done in the past, people just say 'Oh, what a nice boat' and don't care about why he died.

Since then, many people died but no one knows why and everyone is fine about that. Meanwhile, the devil sends her knight to challenge you with Algorithm contest.

There is a hard data structure problem in the contest:

There are n numbers a_1,a_2,...,a_n on a line, everytime you can change every number in a segment [l,r] into a number x(type 1), or change every number a_i in a segment [l,r] which is bigger than x to gcd(a_i,x) (type 2).

You should output the final sequence.

 

 

Input

The first line contains an integer T, denoting the number of the test cases.
For each test case, the first line contains a integers n.
The next line contains n integers a_1,a_2,...,a_n separated by a single space.
The next line contains an integer Q, denoting the number of the operations.
The next Q line contains 4 integers t,l,r,x. t denotes the operation type.

T<=2,n,Q<=100000
a_i,x >=0
a_i,x is in the range of int32(C++)

 

 

Output

For each test case, output a line with n integers separated by a single space representing the final sequence.
Please output a single more space after end of the sequence

 

 

Sample Input

1

10

16807 282475249 1622650073 984943658 1144108930 470211272 101027544 1457850878 1458777923 2007237709

10

1 3 6 74243042

2 4 8 16531729

1 3 4 1474833169

2 1 8 1131570933

2 7 9 1505795335

2 3 7 101929267

1 4 10 1624379149

2 2 8 2110010672

2 6 7 156091745

1 2 5 937186357

 

 

Sample Output

16807 937186357 937186357 937186357 937186357 1 1 1624379149 1624379149 1624379149

 

 

Author

WJMZBMR

 

 

 

题意：给定一个数字序列，对其进行两种操作：1、将序列中连续的一段变成一样的数x；2、给序列中连续的一段和一个数x，对于这个连续一段中的每个数，如果小于x则取x与这个数的最大公约数，否则不操作。

题解：线段树+懒人标记

代码：

  1 #include <cstdio>

  2 #include <cstring>

  3 

  4 const int LEN = 400040;

  5 

  6 struct line

  7 {

  8     int left;

  9     int right;

 10     int value;

 11 }line[LEN*2];

 12 int point[LEN*2]; //记录线段树底层节点的位置

 13 

 14 inline int gcd(int a,int b)  //求最大公约数

 15 {

 16     return a % b ? gcd(b, a % b) : b;

 17 }

 18 

 19 void buildt(int left, int right, int step) //建树同时初始化懒惰标记

 20 {

 21     line[step].value = -1;

 22     line[step].left = left;

 23     line[step].right = right;

 24     if (left == right){

 25         point[left] = step;

 26         return;

 27     }

 28     int mid = (left + right) / 2;

 29     buildt(left, mid, step*2);

 30     buildt(mid+1, right, step*2+1);

 31 }

 32 

 33 void query_1(int left, int right, int x, int step)  //操作一

 34 {

 35     if (left == line[step].left && right == line[step].right){

 36             line[step].value = x;

 37             return;

 38     }

 39     if (line[step].value != -1){

 40         line[step*2].value = line[step*2+1].value = line[step].value;

 41         line[step].value = -1;

 42     }

 43     int mid = (line[step].left + line[step].right) / 2;

 44     if (right <= mid)

 45         query_1(left, right, x, step*2);

 46     else if (left > mid)

 47         query_1(left, right, x, step*2+1);

 48     else{

 49         query_1(left, mid, x, step*2);

 50         query_1(mid+1, right, x, step*2+1);

 51     }

 52 }

 53 

 54 void query_2(int left, int right, int x, int step) //操作函数二

 55 {

 56     if (line[step].left == left && line[step].right == right){ 

 57         if (line[step].value != -1){    //如果找到对应区间，且有标记，则进行条件判断，否则继续

 58             if (line[step].value > x)

 59                 line[step].value = gcd(line[step].value, x);

 60             return;

 61         }

 62     }

 63     if (line[step].value != -1){  //如果改点被标记，则下移一层

 64         line[step*2].value = line[step*2+1].value = line[step].value;

 65         line[step].value = -1;

 66     }

 67     int mid = (line[step].left + line[step].right) / 2;

 68     if (right <= mid)

 69         query_2(left, right, x, step*2);

 70     else if (left > mid)

 71         query_2(left, right, x, step*2+1);

 72     else{

 73         query_2(left, mid, x, step*2);

 74         query_2(mid+1, right, x, step*2+1);

 75     }

 76 }

 77 

 78 void findans(int left, int right, int step)  //dfs输出结果

 79 {

 80     if (line[step].left == left && line[step].right == right){

 81         if (line[step].value != -1){

 82             for(int i = 0; i < line[step].right - line[step].left + 1; i++)

 83                 printf("%d ", line[step].value);

 84             return;

 85         }

 86     }

 87     if (line[step].value != -1){

 88         line[step*2].value = line[step*2+1].value = line[step].value;

 89         line[step].value = -1;

 90     }

 91     int mid = (line[step].left + line[step].right) / 2;

 92     if (right <= mid)

 93         findans(left, right, step*2);

 94     else if (left > mid)

 95         findans(left, right, step*2+1);

 96     else{

 97         findans(left, mid, step*2);

 98         findans(mid+1, right, step*2+1);

 99     }

100 }

101 

102 int main()

103 {

104     int T;

105     //freopen("in.txt", "r", stdin);

106     scanf("%d", &T);

107     while(T--){

108         int n;

109         memset(point, 0, sizeof(point));

110         scanf("%d", &n);

111         buildt(1, n, 1);

112         for(int i = 1; i <= n; i++){

113             int t;

114             scanf("%d", &t);

115             line[point[i]].value = t;

116         }

117         int m;

118         scanf("%d", &m);

119         for(int i = 0; i < m; i++){

120             int t, l, r, x;

121             scanf("%d %d %d %d", &t, &l, &r, &x);

122             if (t == 1){

123                 query_1(l, r, x, 1);

124             }

125             else if (t == 2){

126                 query_2(l, r, x, 1);

127             }

128         }

129         findans(1, n, 1);

130         printf("\n");

131     }

132     return 0;

133 }