
147  The 17th Zhejiang University Programming Contest Sponsored by TuSimple  I
There are n courses in the course selection system of Marjar University. The ith course is described by two values: happiness H_{i} and credit C_{i}. If a student selects m courses x_{1}, x_{2}, ..., x_{m}, then his comfort level of the semester can be defined as follows: Edward, a student in Marjar University, wants to select some courses (also he can select no courses, then his comfort level is 0) to maximize his comfort level. Can you help him? InputThere are multiple test cases. The first line of input contains an integer T, indicating the number of test cases. For each test case: The first line contains a integer n (1 ≤ n ≤ 500)  the number of cources. Each of the next n lines contains two integers H_{i} and C_{i} (1 ≤ H_{i} ≤ 10000, 1 ≤ C_{i} ≤ 100). It is guaranteed that the sum of all n does not exceed 5000. We kindly remind you that this problem contains large I/O file, so it's recommended to use a faster I/O method. For example, you can use scanf/printf instead of cin/cout in C++. OutputFor each case, you should output one integer denoting the maximum comfort. Sample Input2 3 10 1 5 1 2 10 2 1 10 2 10 Sample Output191 0 HintFor the first case, Edward should select the first and second courses. For the second case, Edward should select no courses. 