ZOJ 3745 Salary Increasing

Edward has established a company with n staffs. He is such a kind man that he did Q times salary increasing for his staffs. Each salary increasing was described by three integers (l, r, c). That means Edward will add c units money for the staff whose salaxy is in range [l, r] now. Edward wants to know the amount of total money he should pay to staffs after Q times salary increasing.

The input file contains multiple test cases.

Each case begin with two integers : n -- which indicate the amount of staff; Q -- which indicate Q times salary increasing. The following nintegers each describes the initial salary of a staff(mark as a_i). After that, there are Q triples of integers (l_i, r_i, c_i) (i=1..Q) which describe the salary increasing in chronological.

1 ≤ n ≤ 10⁵ , 1 ≤ Q ≤ 10⁵ , 1 ≤ a_i ≤ 10⁵ , 1 ≤ l_i ≤ r_i ≤ 10⁵ , 1 ≤ c_i ≤ 10⁵ , r_i < l_i+1

Process to the End Of File.

Output the total salary in a line for each case.

4 1
1 2 3 4
2 3 4

18

Hint

{1, 2, 3, 4} → {1, 4, 6, 7}.

这绝对是个水题，但同时又是个不折不扣的大坑题，一开始没注意r_i < l_{i+1 ，差点用线段树做。}

 1 #include <iostream>
 2 #include <cstring>
 3 using namespace std;
 4 
 5 long long num[600100],n,m,l,r,add;//坑！开100005不够，因为工资一开始最高为100000，但后面可以涨工资。 
 6 int main()
 7 {
 8     
 9     while (cin>>n>>m)
10     {
11           memset(num,0,sizeof(num));
12           for (int i=1;i<=n;i++)
13           {
14               cin>>add;
15               num[add]++;
16           }
17           for (int i=1;i<=m;i++)
18           {
19               cin>>l>>r>>add;
20               for (int j=r;j>=l;j--)//坑！应该从大到小计算，不然会对后面产生影响。 
21               {
22                   if (num[j])
23                   {
24                              num[j+add]+=num[j];
25                              num[j]=0;
26                   }
27               }
28           }
29           add=0;
30           for (int i=1;i<600100;i++)//坑！一开始只从1算到100000，wrong了好几次，后来发现工资可能超过100000. 
31               add=add+num[i]*i;
32           cout <<add<<endl;
33     }
34     return 0;
35 }

View Code