【CodeForces】371C - Hamburgers（二分）

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C. Hamburgers

time limit per test
1 second

memory limit per test
256 megabytes

input
standard input

output
standard output

Polycarpus loves hamburgers very much. He especially adores the hamburgers he makes with his own hands. Polycarpus thinks that there are only three decent ingredients to make hamburgers from: a bread, sausage and cheese. He writes down the recipe of his favorite
"Le Hamburger de Polycarpus" as a string of letters 'B' (bread), 'S'
(sausage) и 'C' (cheese). The ingredients in the recipe go from bottom to top, for example, recipe "ВSCBS"
represents the hamburger where the ingredients go from bottom to top as bread, sausage, cheese, bread and sausage again.

Polycarpus has nb pieces
of bread, ns pieces
of sausage and nc pieces
of cheese in the kitchen. Besides, the shop nearby has all three ingredients, the prices are pb rubles
for a piece of bread, ps for
a piece of sausage and pc for
a piece of cheese.

Polycarpus has r rubles and he is ready to shop on them. What maximum number of hamburgers can he cook? You can assume that Polycarpus
cannot break or slice any of the pieces of bread, sausage or cheese. Besides, the shop has an unlimited number of pieces of each ingredient.

Input

The first line of the input contains a non-empty string that describes the recipe of "Le Hamburger de Polycarpus". The length of the string doesn't exceed 100, the string contains only letters 'B'
(uppercase English B), 'S' (uppercase English S)
and 'C' (uppercase English C).

The second line contains three integers nb, ns, nc (1 ≤ nb, ns, nc ≤ 100)
— the number of the pieces of bread, sausage and cheese on Polycarpus' kitchen. The third line contains three integers pb, ps, pc (1 ≤ pb, ps, pc ≤ 100)
— the price of one piece of bread, sausage and cheese in the shop. Finally, the fourth line contains integer r (1 ≤ r ≤ 1012)
— the number of rubles Polycarpus has.

Please, do not write the %lld specifier to read or write 64-bit integers in С++. It is preferred to use the cin, cout streams
or the %I64dspecifier.

Output

Print the maximum number of hamburgers Polycarpus can make. If he can't make any hamburger, print 0.

Examples

input

BBBSSC
6 4 1
1 2 3
4

output

2

input

BBC
1 10 1
1 10 1
21

output

7

input

BSC
1 1 1
1 1 3
1000000000000

output

200000000001

看代码吧，二分的范围代码中写的挺明白，check函数写好就行了。

代码如下：

#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;
char han[111];
__int64 need[4] = {0};
__int64 have[4] = {0};
__int64 cost[4] = {0};
__int64 v;
int l;
bool check(__int64 x)
{
__int64 rec = v;
for (int i = 0 ; i < 3 ; i++)
{
if (need[i] == 0)
continue;
if (have[i] / need[i] < x)
{
if ((have[i] + rec / cost[i]) / need[i] < x)
return false;
else
rec -= (x * need[i] - have[i]) * cost[i];
}
}
return true;
}
int main()
{
scanf ("%s",han);
l = strlen(han);
for (int i = 0 ; i < l ; i++)
{
if (han[i] == 'B')
need[0]++;
else if (han[i] == 'S')
need[1]++;
else
need[2]++;
}
scanf ("%I64d %I64d %I64d",have,have+1,have+2);
scanf ("%I64d %I64d %I64d",cost,cost+1,cost+2);
scanf ("%I64d",&v);
__int64 l,r,mid;
l = r = 0;
for (int i = 0 ; i < 3 ; i++)
{
if (need[i] == 0)
continue;
r = max (r , (have[i] + v / cost[i]) / need[i]);
}
while (r >= l)
{
mid = (l + r) >> 1;
if (check(mid))
l = mid + 1;
else
r = mid - 1;
}
printf ("%I64d\n",r);
return 0;
}