negate the contents of result
#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>
using namespace std;
int main()
{
vector<int> v, v2, result(10);
for(unsigned i=0; i < 10; ++i) v.push_back(i);
for(unsigned i=0; i < 10; ++i) v2.push_back(i);
transform(v.begin(), v.end(), v.begin(), negate<int>());
return 0;
}
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