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multimap<int,int> points;
for (int i = 0;i<height;++i)
{
for (int j = 1;j<width;++j)
{
...
points.insert(make_pair(j,i));
}
}
....
int num = points.count(5);
map<int,int> points;
for (int i = 0;i<height;++i)
{
for (int j = 1;j<width;++j)
{
...
points.insert(make_pair(j,i));
}
}