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0059.cpp
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0059.cpp
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class Solution {
public:
vector<vector<int>> generateMatrix(int n) {
if (n == 1)
return { { 1 }};
// see problem 54
vector<vector<int>> result;
result.resize(n);
for (auto& r : result)
r.resize(n, 0);
int dx = 1;
int dy = 0;
int x = 0;
int y = 0;
int value = 1;
while (true)
{
if (result[y][x] > 0)
break;
result[y][x] = value++;
x += dx;
y += dy;
if (x < 0 || y < 0 || y >= n || x >= n || result[y][x] > 0)
{
x -= dx;
y -= dy;
if (dx == +1) { dx = 0; dy = +1; }
else if (dx == -1) { dx = 0; dy = -1; }
else if (dy == +1) { dx = -1; dy = 0; }
else { dx = +1; dy = 0; }
x += dx;
y += dy;
}
}
return result;
}
};