UAV 11078 - Open Credit System

Problem E
Open Credit System
Input: Standard Input

Output: Standard Output

In an open credit system, the students can chooseany course they like, but there is a problem. Some of the students are moresenior than other students. The professor of such a course has found quite anumber of such students who came from senior classes (as if they came to attendthe pre requisite course after passing an advanced course). But he wants to dojustice to the new students. So, he is going to take a placement test(basically an IQ test) to assess the level of difference among the students. Hewants to know the maximum amount of score that a senior student gets more thanany junior student. For example, if a senior student gets 80 and a juniorstudent gets 70, then this amount is 10. Be careful that we don't want theabsolute value. Help the professor to figure out a solution.

Input
Input consists of a number of test cases T (less than 20). Each case starts with an integer n which is the number of students inthe course. This value can be as large as 100,000 and as low as 2. Next n lines contain n integers where thei'th integer is the score of the i'thstudent. All these integers have absolute values less than 150000. Ifi <j, then i'thstudent is senior to the j'th student.

Output
For each test case, output the desired number in a newline. Follow the format shown in sample input-output section.

SampleInput                             Outputfor Sample Input

321002044321

4

1

2

3

4

80
3
-1

---

Problemsetter: Mohammad Sajjad Hossain

Special Thanks: Shahriar Manzoor

扫描一遍即可，同时维护前面的最大值

#include <cstdio>#include <iostream>#include <vector>#include <algorithm>#include <string>#include <cstring>#include <map>#include <cmath>#include <string>#include <queue>#include <set>using namespace std;#ifdef WINtypedef __int64 LL;#define iform "%I64d"#define oform "%I64d\n"#elsetypedef long long LL;#define iform "%lld"#define oform "%lld\n"#endifconst int INF = 0x3f3f3f3f;const int maxn = 100 + 10;int main() {int T;scanf("%d", &T);while(T--) {int n;int ans = -INF;int tmax;scanf("%d%d", &n, &tmax);for(int i=1; i<n; i++) {int t;scanf("%d", &t);if(tmax - t > ans) {ans = tmax - t;}tmax = max(tmax, t);}printf("%d\n", ans);}return 0;}