Submission #4262331
Source Code Expand
#include <algorithm> #include <iostream> #include <cstring> #include <cstdio> #include <bitset> #include <cmath> #include <queue> #include <map> #include <set> using namespace std; #define rg register #define LL long long #define __space putchar(' ') #define __endl putchar('\n') template <typename qwq> inline void read(qwq & x) { x = 0; rg int f = 1; rg char c = getchar(); while (c < '0' || c > '9') { if (c == '-') f = -1; c = getchar(); } while (c >= '0' && c <= '9') { x = (x << 1) + (x << 3) + (c ^ 48); c = getchar(); } x *= f; } template <typename qaq> inline void print(qaq x) { if (x < 0) { putchar('-'); x = -x; } if (x > 9) print(x / 10); putchar(x % 10 + '0'); } struct node { int val,data; }a[233333]; int n; LL ans; bitset<1000000005> s; inline bool cmp(node x,node y)//预处理为有序 { return x.val < y.val; } int main() { read(n); ans = n; for (rg int i = 1;i <= n;++i) { read(a[i].val); a[i].data = i; } stable_sort(a + 1,a + 1 + n,cmp); for (rg int i = 1;i <= n;++i) { if (s[a[i].val]) continue; rg bool odd_i = i & 1,odd_data = a[i].data & 1; if (odd_i == odd_data) s[a[i].val] = true,--ans;//若位置变化后与变化前的奇偶性相同 //说明他们必须用操作1才可达到,其余的均可用操作2达到 } print(ans >> 1);//一个奇数位置需要操作1,定有一个对应的偶数位置需要操作1,故/ 2 }
Submission Info
Submission Time | |
---|---|
Task | C - BBuBBBlesort! |
User | luogu_bot2 |
Language | C++ (GCC 5.4.1) |
Score | 600 |
Code Size | 1554 Byte |
Status | AC |
Exec Time | 50 ms |
Memory | 123648 KB |
Judge Result
Set Name | Sample | All | ||||
---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 600 / 600 | ||||
Status |
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Set Name | Test Cases |
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Sample | s1.txt, s2.txt |
All | 01.txt, 02.txt, 03.txt, 04.txt, 05.txt, 06.txt, 07.txt, 08.txt, 09.txt, 10.txt, 11.txt, 12.txt, 13.txt, 14.txt, 15.txt, 16.txt, 17.txt, 18.txt, 19.txt, 20.txt, 21.txt, 22.txt, s1.txt, s2.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
01.txt | AC | 50 ms | 123520 KB |
02.txt | AC | 49 ms | 123520 KB |
03.txt | AC | 50 ms | 123520 KB |
04.txt | AC | 50 ms | 123520 KB |
05.txt | AC | 46 ms | 123520 KB |
06.txt | AC | 46 ms | 123520 KB |
07.txt | AC | 46 ms | 123520 KB |
08.txt | AC | 39 ms | 123520 KB |
09.txt | AC | 39 ms | 123520 KB |
10.txt | AC | 40 ms | 123520 KB |
11.txt | AC | 40 ms | 123520 KB |
12.txt | AC | 40 ms | 123520 KB |
13.txt | AC | 39 ms | 123520 KB |
14.txt | AC | 45 ms | 123648 KB |
15.txt | AC | 46 ms | 123520 KB |
16.txt | AC | 46 ms | 123520 KB |
17.txt | AC | 45 ms | 123520 KB |
18.txt | AC | 32 ms | 123136 KB |
19.txt | AC | 32 ms | 123136 KB |
20.txt | AC | 32 ms | 123136 KB |
21.txt | AC | 32 ms | 123136 KB |
22.txt | AC | 32 ms | 123136 KB |
s1.txt | AC | 32 ms | 123136 KB |
s2.txt | AC | 32 ms | 123136 KB |