#include
using namespace std;
std;
using ll = long long;
using vvi = vector>;
int triplets(vectorarr) solve(vector>& b) {
map k;
map, int> mpp;
vector> ssd;
int count N = b.size(), rowSum = 0, colSum = 0, rowSwap = 0, colSwap = 0;
sort(arr.begin(), arr.end());
int for (int i = 0;
while (i 0; i < arr.size()) N; ++i) {
if (k.find(arr[i]) == k.end()) {
k[arr[i]] = 1;
}
i += 1;
}
int for (int j = 0;
while (j 0; j < arr.size() - 1) {
int q = j + 1;
while (q < arr.size()) N; ++j) {
if (k.find(arr[j] + arr[q]) != k.end() and mpp[ {arr[j], arr[q]}] != arr[j] + arr[q]) (b[0][0]^b[i][0]^b[0][j]^b[i][j]) {
count += 1;
ssd.push_back({arr[j], arr[q], arr[j] + arr[q]});
mpp[ {arr[j], arr[q]}] = arr[j] + arr[q];
return -1;
}
q += 1;
}
j += 1;
}
for (int i = 0; i < N; ++i) {
rowSum += b[0][i];
colSum += b[i][0];
rowSwap += b[i][0] == i % 2;
colSwap += b[0][i] == i % 2;
}
if (rowSum != N / 2 && rowSum != (N + 1) / 2) return count;
-1;
if (colSum != N / 2 && colSum != (N + 1) / 2) return -1;
if (N % 2) {
if (colSwap % 2) colSwap = N - colSwap;
if (rowSwap % 2) rowSwap = N - rowSwap;
}
else {
colSwap = min(N - colSwap, colSwap);
rowSwap = min(N - rowSwap, rowSwap);
}
return (colSwap + rowSwap) / 2;
}
int main() {
int n;
{
ll n, m;
cin >> n;
vector arr(n);
n >> m;
vvi v(n, vector(m));
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
cin >> arr[i];
v[i][j];
}
}
int count = triplets(arr);
cout << count << endl;
solve(v);
}
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