What's the highest score?

Title Description:

The teacher wants to know from the so-and-so classmate, the highest score is how many, now asks you to program the simulation teacher's inquiry. Of course, teachers sometimes need to update a student's grades.
Input Description:
The input includes multiple sets of test data.
The first line of each set of inputs is two positive integers N and m (0 < N <= 30000,0 < M < 5000), representing the number of students and the number of operations respectively.
Student ID number from 1 to N.
The second line contains n integers representing the initial scores of the N students, where the number of I represents the student's score for ID i.
Next M-line, each line has a character C (only ' Q ' or ' U '), and two positive integers, a, B, when C is ' Q ', indicating that this is a query operation, he asked the ID from a to B (including A, a) among students, the highest performance is how much
When C is ' U ', it indicates that this is an update operation that requires the student with ID A to change the grade to B.

Output Description:
For each query operation, output the highest score in one line.

Input Example:
5 7
1 2 3) 4 5
Q 1 5
U 3 6
Q 3 4
Q 4 5
U 4 5
U 2 9
Q 1 5

Output Example:
5
6
5
9

Simple question, ac on the bull, the code is as follows:

1#include <stdio.h>2#include <iostream>3 using namespacestd;4 5 intMain ()6 {7     intm,n,score[30000];8     CharOper;9      while(Cin >> N >>M)Ten     { One          for(inti =0; i < N; ++i) A         { -scanf"%d", score +i); -         } the          for(intj =0; J < M; ++j) -         { -             intA, B, Max; -CIN >> Oper >> A >>B; +             if(Oper = ='Q') -             { +                 if(A > N | | B >N) A                 { at                     return 0; -                 } -                 Else -                 { -                     if(A >B) -                     { in                         intTMP =A; -A =B; toB =tmp; +                     } -max = Score[a-1]; the                      for(intK = A; K < B; k++) *                     { $                         if(Max <Score[k])Panax Notoginseng                         { -Max =Score[k]; the                         } +                     } Acout << Max <<Endl; the                 } +                  -             }  $             Else if(Oper = ='U') $             { -                 if(A >N) -                 { the                     return 0; -                 }Wuyi                 Else the                 { -Score[a-1] =B; Wu                 } -             } About         } $     } -     return 0; -}

What's the highest score?