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Leftmost Digit

2
3
4

2
2

Hint
In the first case, 3 * 3 * 3 = 27, so the leftmost digit is 2.
In the second case, 4 * 4 * 4 * 4 = 256, so the leftmost digit is 2.
 

要了解 log的用法、pow函数的用法

#include<stdio.h>
#include<math.h>
int main()
{
	int T,a;
	double m;
	scanf("%d",&T);
	while(T--)
	{
		__int64 N;
		double a;
		scanf("%I64d",&N);
		m=N*log10((double)N)-(__int64)(N*log10((double)N));
		a=pow(10.0,m);
		printf("%d\n",(int)a);
	}
	return 0;

HDU 1060 Leftmost Digit,布布扣,bubuko.com

HDU 1060 Leftmost Digit

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原文地址：http://blog.csdn.net/qq_16767427/article/details/38237177