我自己做的代码如下 但是通不过 测了好多数据都没问题
#include<cstdio>
#include<cstring>
using namespace std;
int main()
{
int n;
char str[1000][1000];
double arr[1000];
while (scanf("%d", &n) != EOF)
{
getchar();
for (int i = 0; i < n; i++){
gets(str[i]);
double sum = 0;
double thisEle = 0;
double orign = 0;
for (int j = 0; j < strlen(str[i]); j++){
if (str[i][j] == 'C'){
sum += thisEle;
thisEle = 12.01;
}
else if (str[i][j] == 'H'){
sum += thisEle;
thisEle = 1.008;
}
else if (str[i][j] == 'O'){
sum += thisEle;
thisEle = 16.00;
}
else if (str[i][j] == 'N'){
sum += thisEle;
thisEle = 14.01;
}
else{
if (str[i][j - 1] >= 48 && str[i][j - 1] <= 57){
double temp = 10 * thisEle;
thisEle = temp + (str[i][j] - 48)*orign;
}
else{
orign = thisEle;
thisEle *= (str[i][j] - 48);
}
}
}
sum += thisEle;
arr[i] = sum;
}
for (int i = 0; i < n; i++){
printf("%.3lf\n", arr[i]);
}
}
}
https://github.com/svanegas/programming_solutions/blob/master/UVa/1586%20-%20Molar%20Mass/1586.cpp