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function oddmatrix(row,col,locs)
local mat = {}
for i=1,row do
mat[i]={}
for j=1,col do
mat[i][j]=0
end
end
for i,v in ipairs(locs) do
-- apply to rows
for k=1,col do
mat[v[1]+1][k]=mat[v[1]+1][k]+1
end
-- apply to cols
for l=1,row do
mat[l][v[2]+1] = mat[l][v[2]+1]+1
end
end
local odds=0
for i=1,row do
for j=1,col do
if mat[i][j]%2~=0 then
odds = odds + 1
end
end
end
print("odds ", odds)
end
oddmatrix(2,3,{{0,1},{1,1}})
oddmatrix(2,2,{{1,1},{0,0}})
oddmatrix(3,3,{{0,0},{1,2},{2,1}})
oddmatrix(1,5,{{0,2},{0,4}})
oddmatrix(4,2,{{1,0},{3,1},{2,0},{0,1}})
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