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rod_cut.c
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rod_cut.c
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/*
* Count the number of 1 bits in a integer.
*/
#include<stdlib.h>
#include<stdio.h>
#define max(a,b) ((a)>(b)?(a):(b))
int get_max_rev_help(int rev[], int record[], int size)
{
int max_value = -1;
int i;
if (0 <= record[size]) return record[size];
if (0 == size) {
max_value = 0;
} else {
for (i = 1; i <= size; i++)
max_value = max(max_value, rev[i] + get_max_rev_help(rev, record, size - i));
}
record[size] = max_value;
return max_value;
}
int get_max_rev(int rev[], int size)
{
int record[size + 1];
int i;
int revnue;
for (i = 0; i <= size; i++) record[i] = -1;
revnue = get_max_rev_help(rev, record, size);
return revnue;
}
int main(int argc, char *argv[])
{
int rod_rev[11] = {0, 1, 5, 8, 9, 10, 17, 17, 20, 24, 30};
if (2 != argc) {
printf("Plz give me a rod size number.\n");
return -1;
}
int size = atoi(argv[1]);
if (0 > size) {
printf("Need a positive number...\n");
return -1;
}
if (10 < size) {
printf("rod size should be <= 10.\n");
return -1;
}
printf("The max revenue for size %d rod is %d.\n", size, get_max_rev(rod_rev, size));
return 0;
}