c++ - Flood Fill recursive stack overflow -

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if try fill 100x100 rectangle overflow. 50x50 works fine.

is there way fix overflow?

i print out stack number , working rectangle stack higher big 1 (it crashes around 7000).

void draw(int x, int y) { if ((x >= 0 && x < 100) && (y >= 0 && y < 100))     {             canvas.set_pixel(x, y);             if (!canvas.get_pixel(x, y + 1))draw(x, y + 1);             if (!canvas.get_pixel(x, y-1))draw(x, y - 1);             if (!canvas.get_pixel(x - 1, y))draw(x - 1, y);             if (!canvas.get_pixel(x+1, y))draw(x + 1, y);         }      return; }

don't use recursion. instead, use stack store coordinates want draw. , iterate until stack empty.

void draw(int x, int y) {     struct coordinate { int x, y; };     std::stack<coordinate> to_draw;     to_draw.push({x, y});      while (!to_draw.empty())     {         auto top = to_draw.top();         to_draw.pop();         if (  (top.x >= 0 && top.x < 100)            && (top.y >= 0 && top.y < 100)            && !canvas.get_pixel(top.x, top.y))         {             canvas.set_pixel(top.x, top.y);             to_draw.push({top.x, top.y + 1});             to_draw.push({top.x, top.y - 1});             to_draw.push({top.x + 1, top.y});             to_draw.push({top.x - 1, top.y});         }                 } }

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