c语言网.1095.3n+1问题这个题目描述, 并没有明确表明输入的ij大小符合规范, 只是说between,所以在for循环里区间设定之前要先排序以下我的代码:#include <stdio.h>int cyc_len(int x){ int sum = 0; while(x != 1) { sum++; if(x % 2 == 0) x /= 2; else x = x*3 + 1; } return sum+1;}void swap(int *x, int *y){ int tmp; if(*x > *y) { tmp = *x; *x = *y; *y = tmp; }}int main(){ int x, y; while(~scanf("%d%d", &x, &y)) { printf("%d %d ", x, y); swap(&x, &y); int i, sum = 0; for(i=x; i<=y; i++) { if(sum < cyc_len(i)) sum = cyc_len(i); } printf("%d\n",sum); } return 0;}
