POJ 1180 Batch Scheduling (dp, double-ended queue)

 1 #include <iostream>
 2 using namespace std;
 3 const int MAX_N = 10000 + 8;
 4 int S, N;
 5 int T[MAX_N], F[MAX_N];
 6 int sum_F[MAX_N];
 7 int dp[MAX_N];
 8 int solve()
 9 {
10     for (int j = N - 1; j >= 0; --j)
11     {
12         int f = sum_F[N] - sum_F[j], t = S;
13         for (int i = 1; j + i <= N && i <= 200; i++)
14         {
15             t += T[j + i - 1];
16             dp[j] = min(dp[j], t * f + dp[j + i]);
17         }
18     }
19     return dp[0];
20 }
21 int main()
22 {
23 #ifndef ONLINE_JUDGE
24     freopen("in.txt", "r", stdin);
25 #endif
26     scanf("%d%d", &N, &S);
27     memset(dp, 0x3f, N * sizeof(int));
28     for (int i = 0; i < N; ++i)
29     {
30         scanf("%d%d", T + i, F + i);
31         sum_F[i + 1] = sum_F[i] + F[i];
32     }
33     printf("%d\n", solve());
34 #ifndef ONLINE_JUDGE
35     fclose(stdin);
36 #endif
37     return 0;
38 }

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