2017年5月14日爱奇艺算法比赛

1，爱奇艺节目采购（0-1背包）

题目保证n<=3000

我的代码：（通过7/8）

#include <iostream>
#include<string.h>
using namespace std;

int value[1000001], volume[1000001], list[1000001];
int main()
{
  int n = 0, v;
  cin >> v;
  memset(list, 0, sizeof(list));
  while (cin >> volume[n] >> value[n])n++;
  for (int i = 0; i < n; i++)for (int j = v; j >= volume[i]; j--)
  if (list[j] < list[j - volume[i]] + value[i])list[j] = list[j - volume[i]] + value[i];
cout << list[v] << endl;
return 0;
}

2，切割木材（二分法）

题目保证n<=1000

我的代码：（通过9/10）

#include <iostream>
using namespace std;

int l[1000], n = 0;

int num(int len)
{
  int s = 0;
  for (int i = 0; i < n; i++)s += l[i] / len;
return s;
}

int main()
{
int k, m = 0;
cin >> k;
  while (cin >> l[n])
  {
    if (m < l[n])m = l[n];
n++;
}
int low = 1, high = m, mid;
while (high>low + 1)
  {
    mid = (high + low) / 2;
    if (num(mid) < k)high = mid;
else low = mid;
}
if (num(high) < k)high--;
  if (high>0 && num(high) < k)high--;
cout << high;
return 0;
}

3，吹气球

我的代码：（通过2/5）

#include <iostream>
using namespace std;

int main()
{
  int l[502], n, s = 0;
  cin >> n;
  for (int i = 1; i <= n; i++)cin >> l[i];
  l[0] = l[n + 1] = 1;
  while (n)
  {
    int k = 1, m = 100, kk;
    for (int i = 1; i <= n; i++)if (m > l[i])m = l[i], k = i;
    kk = k;
    while (l[kk + 1] == l[kk] && kk<n)kk++;
if (l[kk + 1] > l[k - 1])k = kk;
    s += l[k - 1] * l[k] * l[k + 1];
    for (int i = k; i <= n; i++)l[i] = l[i + 1];
n--;
}
cout << s;
return 0;
}

我是用贪心做的，不知道思路对不对

4，奇鹿