norela.cpp: In function 'bool possible(int*, int)':
norela.cpp:38:25: error: call of overloaded 'to_string(int)' is ambiguous
s+=to_string(j+1);
^
norela.cpp:15:8: note: candidate: std::__cxx11::string to_string(int)
string to_string(int n){
^~~~~~~~~
In file included from /usr/include/c++/7/string:52:0,
from /usr/include/c++/7/bits/locale_classes.h:40,
from /usr/include/c++/7/bits/ios_base.h:41,
from /usr/include/c++/7/ios:42,
from /usr/include/c++/7/istream:38,
from /usr/include/c++/7/sstream:38,
from /usr/include/c++/7/complex:45,
from /usr/include/c++/7/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
from norela.cpp:1:
/usr/include/c++/7/bits/basic_string.h:6454:3: note: candidate: std::__cxx11::string std::__cxx11::to_string(long double)
to_string(long double __val)
^~~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6445:3: note: candidate: std::__cxx11::string std::__cxx11::to_string(double)
to_string(double __val)
^~~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6436:3: note: candidate: std::__cxx11::string std::__cxx11::to_string(float)
to_string(float __val)
^~~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6430:3: note: candidate: std::__cxx11::string std::__cxx11::to_string(long long unsigned int)
to_string(unsigned long long __val)
^~~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6424:3: note: candidate: std::__cxx11::string std::__cxx11::to_string(long long int)
to_string(long long __val)
^~~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6418:3: note: candidate: std::__cxx11::string std::__cxx11::to_string(long unsigned int)
to_string(unsigned long __val)
^~~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6413:3: note: candidate: std::__cxx11::string std::__cxx11::to_string(long int)
to_string(long __val)
^~~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6407:3: note: candidate: std::__cxx11::string std::__cxx11::to_string(unsigned int)
to_string(unsigned __val)
^~~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6402:3: note: candidate: std::__cxx11::string std::__cxx11::to_string(int)
to_string(int __val)
^~~~~~~~~
norela.cpp: In function 'int main()':
norela.cpp:59:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d",&n,&m);
~~~~~^~~~~~~~~~~~~~