There is just a small bug in the line:
if(req<prox_avail)
Figure it out, its a minor one and easy to spot too. This should give you AC as far as your code is concerned 
.
And please don’t post the whole source code here, just provide the link to your code as it makes it tough for the other people to browse through the editorial.
Hello,
i executed my code with two different ways to calculate the minimum of days he has to be attendant.
timeDuration = All Lessons he should have attended.
int x = (int) Math.ceil(((timeDuration/100.0)*75));
int y = (int) Math.ceil(timeDuration*0.75);
With way 1 i got a wrong answer, way 2 worked. i tested both ways with some numbers and 1 and 2 output allways the same.
Can you give me an example where 1 is wrong ?
Why am I getting Wrong Answer
#include <bits/stdc++.h>
using namespace std;
int main()
{
int t,n,present_count,count,flag,i;
float attendence;
string s;
cin >> t;
while(t--)
{
cin >> n;
cin >> s;
present_count = 0,count = 0,flag = 0;
for(i=0; i<n; i++)
{
if(s[i] == 'P')
present_count++;
}
attendence = (float)present_count/n;
if(attendence >= 0.75)
{
cout << 0 << "\n";
continue;
}
else
{
for(i=2; i<n-2; i++)
{
if(s[i] == 'A')
{
if( (s[i-1] == 'P' || s[i-2] == 'P') && (s[i+1] == 'P' || s[i+2] == 'P') )
{
s[i] = 'P';
count++; present_count++;
attendence = (float)present_count/n;
if(attendence >= 0.75)
{
flag = 1;
break;
}
}
}
}
if(flag == 0)
cout << -1 << "\n";
else
cout << count << "\n";
}
}
}What is is wrong in this code?
#include
#include<string.h>
using namespace std;
int main()
{
int D,T,i,j,P,change=0;
char S[1000];
cin>>T;
if(T>2000)
{
exit(0);
}
for(i=0;i<T;i++)
{
cin>>D>>S;
if(D>1000)
{
exit(0);
}
for(j=0;j<D;j++)
{
if(S[j]!=‘A’&&S[j]!=‘P’)
{
exit(0);
}
}
for(j=0;j<D;j++)
{
if(S[j]==‘P’)
{
P++;
}
}
if((P*100)/D>=75)
{
cout<<0;
}
else
{
for(j=2;j<D-2;j++)
{
if(S[j]=='A')
{
if(S[j-2]=='P'||S[j-1]=='P'||S[j+2]=='P'||S[j+1]=='P')
{
change++;
P=P+1;
if(((P*100)/D)>=75)
{
cout<<change;
break;
}
}
}
}
}
}
}
for x in range(int(input())):
d = int(input())
s = input()
a = s.count(‘P’)
b = 0
if a/d >= 0.75:
print(-1)
else:
for y in range(2,d-2):
if s[y] == ‘A’ and (s[y-1] == ‘P’ or s[y-2] == ‘P’) and (s[y+1] == ‘P’ or s[y+2] == ‘P’):
a += 1
b += 1
if a/d >= 0.75:
print(b)
break
else:
print(-1)
What’s Wrong With My Code…
You have an out-of-bounds access here:
s[d]='\0';
https://www.codechef.com/viewsolution/29305865
Can somebody find a test case for which this solution is wrong
I have tried all the test cases provided in this discussion thread.
Consider the testcase:
1
13
PAPAPAPPAPAAA
Thank you
found the error
All within 3 minutes
please help me where i am wrong 
#include <bits/stdc++.h>
using namespace std;
using ll=long long int;
int main() {
// your code goes here
int t;
cin>>t;
while(t–)
{
int n,i,p=0,prox=0,np=0;
string s;
double per;
cin>>n;
cin>>s;
if(n==1)
{
if(s[0]==‘A’)
cout<<1<<endl;
else
cout<<0<<endl;
}
else if(n==2)
{
if((s[0]==‘A’) && (s[1]==‘A’))
cout<<2<<endl;
else if(((s[0]==‘A’) && (s[1]==‘P’))|| ((s[0]==‘P’) && (s[1]==‘A’)))
cout<<1<<endl;
else
cout<<0<<endl;
}
else
{
for(i=0;i<n;i++)
{
if(s[i]==‘P’)
p++;
}
per=(double)p/n;
if(per>=0.75)
cout<<0<<endl;
else
{
for(i=0;i<n;i++)
{
if(i==0)
{
if((s[i]==‘A’) && ((s[i+1]==‘P’) || (s[i+1]==‘P’)))
{
p++;
np++;
s[i]=‘P’;
}
}
else if(i==1)
{
if((s[i]==‘A’) && ((s[i+1]==‘P’) || (s[i+2]==‘P’) ||(s[i-1]==‘P’)))
{
p++;
np++;
s[i]=‘P’;
}
}
else
{
if((s[i]==‘A’) && ((s[i+1]==‘P’) || (s[i+2]==‘P’) ||(s[i-1]==‘P’) || (s[i-2]==‘P’)))
{
p++;
np++;
s[i]=‘P’;
}
}
per=(double)p/n;
if(per>=0.75)
break;
}
//cout<<“per=”<<per<<“np=”<<np<<endl;
if(per>=0.75)
cout<<np<<endl;
else
cout<<-1<<endl;
}
}
}
return 0;
}
Please either format your code or (better!) link to your submission - the forum software has mangled it and it won’t compile! 
Thanks! The following test input causes an out-of-bounds access in your solution:
1
5
AAAAA
It gives -1 as output
That is correct output,i think.
For this input i get -1 as output that is correct
https://www.codechef.com/viewsolution/37764805
Please help me out with the code.Dummy testcases have passed.If anybody can find me some test cases which are outputting wrong from my code.
Thanks in advance.
Consider the test input:
1
4
PAAP