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drawing_skyline.cc
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drawing_skyline.cc
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#include <algorithm>
#include <vector>
#include "test_framework/fmt_print.h"
#include "test_framework/generic_test.h"
#include "test_framework/serialization_traits.h"
using std::max;
using std::min;
using std::numeric_limits;
using std::vector;
struct Rect;
typedef vector<Rect> Skyline;
struct Rect {
int left, right, height;
};
typedef vector<Rect> Skyline;
Skyline ComputeSkyline(const vector<Rect>& buildings) {
int min_left = numeric_limits<int>::max(),
max_right = numeric_limits<int>::min();
for (const Rect& building : buildings) {
min_left = min(min_left, building.left);
max_right = max(max_right, building.right);
}
vector<int> heights(max_right - min_left + 1, 0);
for (const Rect& building : buildings) {
for (int i = building.left; i <= building.right; ++i) {
heights[i - min_left] = max(heights[i - min_left], building.height);
}
}
Skyline result;
int left = 0;
for (int i = 1; i < size(heights); ++i) {
if (heights[i] != heights[i - 1]) {
result.emplace_back(
Rect{left + min_left, i - 1 + min_left, heights[i - 1]});
left = i;
}
}
result.emplace_back(Rect{left + min_left, max_right, heights.back()});
return result;
}
bool operator==(const Rect& a, const Rect& b) {
return a.left == b.left && a.right == b.right && a.height == b.height;
}
template <>
struct SerializationTraits<Rect> : UserSerTraits<Rect, int, int, int> {};
std::ostream& operator<<(std::ostream& out, const Rect& r) {
return PrintTo(out, std::make_tuple(r.left, r.right, r.height));
}
int main(int argc, char* argv[]) {
std::vector<std::string> args{argv + 1, argv + argc};
std::vector<std::string> param_names{"buildings"};
return GenericTestMain(args, "drawing_skyline.cc", "drawing_skyline.tsv",
&ComputeSkyline, DefaultComparator{}, param_names);
}