#include #define rd_int(var, tmp) \ for (;;) { \ tmp = getc_unlocked(stdin); \ if (tmp < '0' || tmp > '9') break; \ var = var * 10 + tmp - '0'; \ } // char buf[9]; int ptr = 0; を先に宣言する #define wt_int(var, buf, ptr) \ while (var) { \ buf[ptr++] = var % 10; \ var /= 10; \ } \ while (ptr--) putc_unlocked(buf[ptr] + '0', stdout); int a[] = {1000000, 355065, 153009, 70685, 33758, 16414, 8065, 3988, 1979, 985, 491, 245, 122, 61, 30, 15, 7, 3, 1}; int main() { int k, n = 0, ptr = 0; char buf[8]; rd_int(n, k); n -= 2; n = (n < 19 ? a[n] : 0); wt_int(n, buf, ptr); return 0; }