#include <stdio.h> #define MAX_NUM 1000000000 int nums[50000]; int ans(int n, int sign) { int last = sign * MAX_NUM; int res = 0; for (int i = 0; i < n; i++) { if (sign * (last - nums[i]) > 0) { last = nums[i]; } else { last = -sign * MAX_NUM; res++; } sign = -sign; } return res; } int main(void) { int n; scanf("%d", &n); for (int i = 0; i < n; i++) scanf("%d", &nums[i]); int ansp = ans(n, +1); int ansn = ans(n, -1); printf("%d\n", ansp < ansn ? ansp : ansn); }
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | #include <stdio.h> #define MAX_NUM 1000000000 int nums[50000]; int ans(int n, int sign) { int last = sign * MAX_NUM; int res = 0; for (int i = 0; i < n; i++) { if (sign * (last - nums[i]) > 0) { last = nums[i]; } else { last = -sign * MAX_NUM; res++; } sign = -sign; } return res; } int main(void) { int n; scanf("%d", &n); for (int i = 0; i < n; i++) scanf("%d", &nums[i]); int ansp = ans(n, +1); int ansn = ans(n, -1); printf("%d\n", ansp < ansn ? ansp : ansn); } |