int maxKilledEnemies(vector<vector<char>>& grid) {

int m = grid.size();

if(m == 0) return 0;

int n = grid[0].size();

if(n == 0) return 0;

vector<vector<int>> row(m, vector<int>(n, 0));

vector<vector<int>> col(m, vector<int>(n, 0));

for(int i = 0; i < m; ++i) {

int cnt = 0;

for(int j = 0; j < n; ++j) {

int start = j;

while(j < n and grid[i][j] != 'Y') {

cnt += (grid[i][j] == 'X'); ++j;

}

for(int k = start; k < j; ++k) {

if(grid[i][k] == '0') {

row[i][k] = cnt;

}

}

cnt = 0;

}

}

for(int j = 0; j < n; ++j) {

int cnt = 0;

for(int i = 0; i < m; ++i) {

int start = i;

while(i < m and grid[i][j] != 'Y') {

cnt += (grid[i][j] == 'X'); ++i;

}

for(int k = start; k < i; ++k) {

if(grid[k][j] == '0') {

col[k][j] = cnt;

}

}

cnt = 0;

}

}

int result = 0;

for(int i = 0; i < m; ++i) {

for(int j = 0; j < n; ++j) {

if(grid[i][j] == '0') {

result = max(result, row[i][j] + col[i][j]);

}

}

}

return result;

}