int func(int value) {

if (value > 0) return value;

return 1;

}

int matrix[1000][1000];

public:

int calculateMinimumHP(vector<vector<int> > &dungeon) {

int width = dungeon.size();

int height = dungeon[0].size();

// int[][] matrix= new int[width][height];

memset(matrix, 0, sizeof(matrix));

matrix[width - 1][height - 1] = func(1 - dungeon[width - 1][height - 1]);

for (int i = height - 2; i >= 0; --i) {

matrix[width - 1][i] =

func(matrix[width - 1][i + 1] - dungeon[width - 1][i]);

}

for (int i = width - 2; i >= 0; --i) {

matrix[i][height - 1] =

func(matrix[i + 1][height - 1] - dungeon[i][height - 1]);

}

for (int dx = width - 2; dx >= 0; --dx) {

for (int dy = height - 2; dy >= 0; --dy) {

int value1 = matrix[dx + 1][dy];

int value2 = matrix[dx][dy + 1];

matrix[dx][dy] = value1 < value2 ? value1 : value2;

matrix[dx][dy] = func(matrix[dx][dy] - dungeon[dx][dy]);

}

}

return matrix[0][0];

}