spoj Find Log

来源：互联网发布：js实现访客数字统计编辑：程序博客网时间：2024/06/12 00:14

哎，用PHP提交总是Wrong Answer

#include <cstdio>#include <cmath>using namespace std;int main(){    int t;    scanf("%d", &t);    for (int i = 1; i <= t; i++) {        long long b, n;        scanf("%lld%lld", &b, &n);        printf("Case %d: ", i);        if (b == 0 || b == 1 || n == 0) {            printf("Math Error!\n");        } else {            printf("%.5f\n", log(n) / log(b));        }    }    return 0;}

可能php中的每个例子中的两个数不是处于一行中，而fscanf在php中是读取一行的。换成自己实现读取整数后，提交终于成功

代码如下：

<?phpfunction readInt($file){    while (false !== ($ch = fgetc($file))) {        if (ord($ch) >= ord('0') && ord($ch) <= ord('9')) break;    }    $sum = ord($ch) - ord('0');    while (false !== ($ch = fgetc($file))) {        if (!(ord($ch) >= ord('0') && ord($ch) <= ord('9'))) break;        $sum = $sum * 10 + (ord($ch) - ord('0'));    }    return $sum;}$debug = true;$file = STDIN;if ($debug) $file = fopen('./spoj.txt', 'r');$t = readInt($file);for ($i = 1; $i <= $t; $i++) {    $b = readInt($file);    $n = readInt($file);    printf("Case %d: ", $i);    if (0 == $b || 1 == $b || 0 == $n) {        printf("Math Error!\n");    } else {        printf("%.5f\n", log($n) / log($b));    }}if ($debug) fclose($file);

0 0