I'm trying to find bounds in the part of vector from next iterator position to the end of the vector.
The code is:
#include <algorithm>
#include <vector>
#include <iostream>
int
main()
{
typedef std::vector<int> Vector;
Vector v;
v.push_back(3);
v.push_back(7);
v.push_back(15);
v.push_back(21);
std::sort(v.begin(), v.end());
for (Vector::const_iterator i = v.begin(); i != v.end(); ++i) {
Vector::const_iterator low = std::lower_bound(i+1, v.end(), -10-*i);
Vector::const_iterator high = std::upper_bound(i+1, v.end(), 10-*i);
for (Vector::const_iterator j = low; j != high; ++j) {
std::cout << *i << "~" << *j << std::endl;
}
}
return 0;
}
Unfortunately, std::lower_bound(i+1, v.end(), -10-*i)
triggers compilation error which I cannot understand:
c++ -O3 -ggdb -std=c++11 -W -Wall -pedantic -Wl,-stack_size -Wl,0x1000000 2sum.cc -o 2sum
2sum.cc:26:26: error: no matching function for call to 'lower_bound'
V::const_iterator lo = std::lower_bound(i+1, a.end(), -1...
^~~~~~~~~~~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:4085:1: note:
candidate template ignored: deduced conflicting types for parameter
'_ForwardIterator' ('__wrap_iter<const long *>' vs.
'__wrap_iter<long *>')
lower_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp...
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:4070:1: note:
candidate function template not viable: requires 4 arguments, but 3 were
provided
lower_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp...
^
What is the problem with the statement above and how to properly call std::lower_bound
with i+1
iterator?
The error probably says that it can't deduce the template argument - i
is const_iterator
while v.end()
returns iterator
. This should do the trick:
std::lower_bound( i+1, v.cend(), -10-*i);
^^^^^^^^
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