/** * @brief Codeforces Round #275 (Div. 2) c * @file c.cpp * @author 面碼 * @created 2014/12/10 16:54 * @edited 2014/12/10 16:54 * @type math * */#include #include #include #include #include #include #include #include #include using namespace std;#define max(a, b) ((a) > (b) ? (a) : (b))#define min(a, b) ((a) > (b) ? (b) : (a)) #define abs(a) ((a) > 0 ? (a) : (0 - (a)))#define CLR(vec) memset(vec, 0, sizeof(vec))#ifdef DEBUGifstream in;ofstream out;#define CIN in#define COUT out#else#define CIN cin#define COUT cout#endif#define MAXN 100010int n, k;int main(void){ ios_base::sync_with_stdio(0);#ifdef DEBUG CIN.open("./in", ios::in); COUT.open("./out", ios::out);#endif CIN >> n >> k; int idx = 1; int flag = 1; COUT << idx << " "; for(int i = k; i > 0; i--){ if(0 == flag) idx -= i; else idx += i; COUT << idx << " "; flag ^= 1; } for(idx = k + 2; idx <= n; idx++) COUT << idx << " "; COUT << "\n"; return 0;}