标签：题解 msu problem alt number with put visible thml
Kuro is currently playing an educational game about numbers. The game focuses on the greatest common divisor (GCD), the XOR value, and the sum of two numbers. Kuro loves the game so much that he solves levels by levels day by day.
Sadly, he‘s going on a vacation for a day, and he isn‘t able to continue his solving streak on his own. As Katie is a reliable person, Kuro kindly asked her to come to his house on this day to play the game for him.
Initally, there is an empty array aa. The game consists of qq tasks of two types. The first type asks Katie to add a number uiui to aa. The second type asks Katie to find a number vv existing in aa such that ki∣GCD(xi,v)ki∣GCD(xi,v), xi+v≤sixi+v≤si, and xi⊕vxi⊕v is maximized, where ⊕⊕denotes the bitwise XOR operation, GCD(c,d)GCD(c,d) denotes the greatest common divisor of integers cc and dd, and y∣xy∣x means xx is divisible by yy, or report -1 if no such numbers are found.
Since you are a programmer, Katie needs you to automatically and accurately perform the tasks in the game to satisfy her dear friend Kuro. Let‘s help her!
The first line contains one integer qq (2≤q≤1052≤q≤105) — the number of tasks the game wants you to perform.
qq lines follow, each line begins with an integer titi — the type of the task:
It is guaranteed that the type of the first task is type 11, and there exists at least one task of type 22.
For each task of type 22, output on one line the desired number vv, or -1 if no such numbers are found.
5
1 1
1 2
2 1 1 3
2 1 1 2
2 1 1 1
2
1
-1
10
1 9
2 9 9 22
2 3 3 18
1 25
2 9 9 20
2 25 25 14
1 20
2 26 26 3
1 14
2 20 20 9
9
9
9
-1
-1
-1
In the first example, there are 5 tasks:
这题其实可以说是01字典树的裸题， 看了别人的题解 然后就去学了一下01字典树
现在我也只是刚刚学有点懵逼
我看这篇博客学的 转载
源地址https://blog.csdn.net/riba2534/article/details/80344026
1 #include<cstdio> 2 #include<cstring> 3 #include<algorithm> 4 #include<vector> 5 #include<queue> 6 #define inf 0x3fffffff 7 8 using namespace std; 9 typedef long long LL; 10 const int maxn = 2e5 + 10; 11 int a[maxn], minn[maxn], tree[32 * maxn][2]; 12 int sum, root; 13 int newnode() { 14 tree[sum][0] = tree[sum][1] = -1; 15 sum++; 16 return sum - 1; 17 } 18 19 void init() { 20 sum = 0 ; 21 memset(minn, 0x3f, sizeof(minn)); 22 root = newnode(); 23 } 24 25 /* 26 void add(int x) { 27 int p = x; 28 int now = root; 29 minn[now] = min(minn[now], p); 30 for (int i = 31 ; i >= 0 ; i--) { 31 int to = (x >> i ) & 1; 32 if (tree[now][to] == -1) tree[now][to] = newnode(); 33 now = tree[now][to]; 34 minn[now] = min(minn[now], p); 35 } 36 }*/ 37 void add(int x) { 38 int p = x; 39 int now = root ; 40 minn[now] = min(minn[now], p); 41 for (int i = 31 ; i >= 0 ; i--) { 42 int to = (x >> i) & 1; 43 if (tree[now][to] == -1) tree[now][to] = newnode(); 44 now = tree[now][to]; 45 minn[now] = min(minn[now], p); 46 } 47 } 48 /* 49 int getans(int x, int p) { 50 int now = root; 51 if (minn[now] > p) return -1; 52 for (int i = 31 ; i >= 0 ; i-- ) { 53 int to = (x >> i) & 1 ; 54 if (tree[now][to ^ 1] != -1 && minn[tree[now][to ^ 1]] <= p ) to ^= 1; 55 now = tree[now][to]; 56 } 57 return minn[now]; 58 }*/ 59 int getans(int x, int p) { 60 int now = root ; 61 if (minn[now] > p ) return -1; 62 for (int i = 31 ; i >= 0 ; i-- ) { 63 int to = (x >> i) & 1; 64 if (tree[now][to ^ 1] != -1 && minn[tree[now][to ^ 1]] <= p ) to ^= 1; 65 now = tree[now][to]; 66 } 67 return minn[now]; 68 } 69 int main() { 70 int t, op, x, k, s; 71 init(); 72 scanf("%d", &t); 73 while(t--) { 74 scanf("%d", &op); 75 if (op == 1) { 76 scanf("%d", &x); 77 a[x] = 1; 78 add(x); 79 } else { 80 scanf("%d%d%d", &x, &k, &s); 81 if (x % k != 0) { 82 printf("-1\n"); 83 continue; 84 } 85 if (k == 1) { 86 printf("%d\n", getans(x, s - x)); 87 continue; 88 } 89 int maxn = -1, ans = -1; 90 for (int i = k ; i <= s - x ; i += k) { 91 if (a[i] && (i ^ x) > maxn) { 92 maxn = i ^ x; 93 ans = i; 94 } 95 } 96 printf("%d\n", ans); 97 } 98 } 99 return 0; 100 }
D. Kuro and GCD and XOR and SUM
标签：题解 msu problem alt number with put visible thml
原文地址：https://www.cnblogs.com/qldabiaoge/p/9052870.html
