unsigned long long 范围0-18446744073709551615 在本编译环境中 %d=%ld 用%lld (%d=int,%ld=long,%lld=long long;) #include<stdio.h> #include<math.h> int main() { long long h,x; scanf("%lld",&h);//h=x+x*x.4h=4x+4x*x,4h+1=2*2*x+2*2*x*x+1*1,sqrt(4h+1)=2x+1,(s...