LEBOMBS - Editorial

https://www.codechef.com/viewsolution/29815721
what is wrong in this code?

try

1
1
0

https://www.codechef.com/viewsolution/29815931
Corrected code.^

how did your code work for n = 2 cases? wouldn’t count be incremented twice?

Example?
It goes in the bottom part only when n is 1. Otherwise it just does whatever your code does.

say i enter 00, wouldn’t count become 2?

Yes?, it’s supposed to be 2.

1 Like

forget it . My bad

fixed it and it worked. thanks man

Whats wrong in my code?
for _ in range (int(input())):
n=int(input())
s=input()
s=β€œa”+s+β€œa”
s=list(s)
for i in range (1,n+1):
if(s[i]==β€œ1”):
s[i]=β€œa”
s[i-1]=β€œa”
s[i+1]=β€œa”
print(s.count(β€œ0”))

can any one tell what is wrong with my code it is showing wrong answer
ll t;
cin>>t;
while(t–)
{
ll n,i,ans=0;
cin>>n;
bool res[n];
int arr[n];
for(i=0;i<n;i++)
{
cin>>arr[i];
res[i]=false;
}
if(n==1)
{
if(arr[i]==1)
{
cout<<0<<endl;
continue;
}
else
{
cout<<1<<endl;
continue;
}
}
for(i=0;i<n;i++)
{
if(arr[i]==1)
{
if(i==0)
{
res[0]=res[1]=true;
}
else if(i==n-1)
{
res[n-1]=res[n-2]=true;
}
else
{
res[i]=res[i-1]=res[i+1]=true;
}
}
}
for(i=0;i<n;i++)
{
if(res[i]==false)
ans++;
}
cout<<ans<<endl;
}

if it is difficult to read here is the link
https://www.codechef.com/viewsolution/33196385

1 Like

getting this C++ forbids comparison between pointer and integer

my code

#include
#include
using namespace std;

int main() {
int t;
cin>>t;
while(t–){
int n;
cin>>n;
string s;
cin>>s;
int c=0;
for(int i=0 ; i<n; i++){
if(i==0){
if(s[i]==β€œ0” && s[i+1]==β€œ0”){
c++;
}
}
else if(i==n-1){
if(s[i]==β€œ0” && s[i-1]==β€œ0”){
c++;
}
}
else{
if(s[i]==β€œ0” && s[i+1]==β€œ0” && s[i-1]==β€œ0”){
c++;
}
}
}
cout<<c<<"\n";
}
return 0;
}

please help

Please either format your code or (better!) link to your submission - the forum software has mangled it and it won’t compile! :slight_smile:

Edit:

I can probably decipher enough of this to make a guess: replace all occurrences of

"0"

with

'0'

(the former is of type const char*; the latter is char. The type of s[someInt] is char, hence the error).

Edit2:

clang seems to be more helpful, here:

[simon@simon-laptop][18:22:39]
[~/devel/hackerrank/otherpeoples]>clang++ -std=c++14  bhavitjain11-LEBOMBS.cpp   -O3 -g3 -Wall -Wextra  
bhavitjain11-LEBOMBS.cpp:17:28: warning: result of comparison against a string literal is unspecified (use strncmp instead) [-Wstring-compare]
                    if(s[i]=="0" && s[i+1]=="0"){
                           ^ ~~~
bhavitjain11-LEBOMBS.cpp:17:28: error: comparison between pointer and integer ('int' and 'const char *')
                    if(s[i]=="0" && s[i+1]=="0"){
                       ~~~~^ ~~~
bhavitjain11-LEBOMBS.cpp:17:43: warning: result of comparison against a string literal is unspecified (use strncmp instead) [-Wstring-compare]
                    if(s[i]=="0" && s[i+1]=="0"){
                                          ^ ~~~
bhavitjain11-LEBOMBS.cpp:17:43: error: comparison between pointer and integer ('int' and 'const char *')
                    if(s[i]=="0" && s[i+1]=="0"){
                                    ~~~~~~^ ~~~
bhavitjain11-LEBOMBS.cpp:22:28: warning: result of comparison against a string literal is unspecified (use strncmp instead) [-Wstring-compare]
                    if(s[i]=="0" && s[i-1]=="0"){
                           ^ ~~~
bhavitjain11-LEBOMBS.cpp:22:28: error: comparison between pointer and integer ('int' and 'const char *')
                    if(s[i]=="0" && s[i-1]=="0"){
                       ~~~~^ ~~~
bhavitjain11-LEBOMBS.cpp:22:43: warning: result of comparison against a string literal is unspecified (use strncmp instead) [-Wstring-compare]
                    if(s[i]=="0" && s[i-1]=="0"){
                                          ^ ~~~
bhavitjain11-LEBOMBS.cpp:22:43: error: comparison between pointer and integer ('int' and 'const char *')
                    if(s[i]=="0" && s[i-1]=="0"){
                                    ~~~~~~^ ~~~
bhavitjain11-LEBOMBS.cpp:27:28: warning: result of comparison against a string literal is unspecified (use strncmp instead) [-Wstring-compare]
                    if(s[i]=="0" && s[i+1]=="0" && s[i-1]=="0"){
                           ^ ~~~
bhavitjain11-LEBOMBS.cpp:27:28: error: comparison between pointer and integer ('int' and 'const char *')
                    if(s[i]=="0" && s[i+1]=="0" && s[i-1]=="0"){
                       ~~~~^ ~~~
bhavitjain11-LEBOMBS.cpp:27:43: warning: result of comparison against a string literal is unspecified (use strncmp instead) [-Wstring-compare]
                    if(s[i]=="0" && s[i+1]=="0" && s[i-1]=="0"){
                                          ^ ~~~
bhavitjain11-LEBOMBS.cpp:27:43: error: comparison between pointer and integer ('int' and 'const char *')
                    if(s[i]=="0" && s[i+1]=="0" && s[i-1]=="0"){
                                    ~~~~~~^ ~~~
bhavitjain11-LEBOMBS.cpp:27:58: warning: result of comparison against a string literal is unspecified (use strncmp instead) [-Wstring-compare]
                    if(s[i]=="0" && s[i+1]=="0" && s[i-1]=="0"){
                                                         ^ ~~~
bhavitjain11-LEBOMBS.cpp:27:58: error: comparison between pointer and integer ('int' and 'const char *')
                    if(s[i]=="0" && s[i+1]=="0" && s[i-1]=="0"){
                                                   ~~~~~~^ ~~~
bhavitjain11-LEBOMBS.cpp:35:20: warning: result of comparison against a string literal is unspecified (use strncmp instead) [-Wstring-compare]
            if(s[0]=="0"){
                   ^ ~~~
bhavitjain11-LEBOMBS.cpp:35:20: error: comparison between pointer and integer ('int' and 'const char *')
            if(s[0]=="0"){
               ~~~~^ ~~~
8 warnings and 8 errors generated.
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https://ide.geeksforgeeks.org/o5LNJm9pcq

1 Like

Thanks - see my Edit :slight_smile:

1 Like

thanks sir it works

1 Like

thanks

1 Like

Why am I getting NZEC?
Python solution: https://www.codechef.com/viewsolution/38111049

(he solved it: https://www.codechef.com/viewsolution/38111157)

2 Likes