func_code_string: #include <bits/stdc++.h>   using namespace std;   long long a[200001], b[200001];   int main() {     int t;     int i, j;     cin >> t;     while (t--) {       long long n, m;       cin >> n >> m;       for (i = 0; i < n; i++) cin >> a[i] >> b[i];       long long A = 0, B = 0, Ap = 0, Bp = 0;       long long tot = 0, sum = 0;       for (i = 0; i < n; i++) {         A += a[i] - (m - min(m, b[i]));         Ap += m - min(m, b[i]);         B += b[i] - (m - min(m, a[i]));         Bp += m - min(m, a[i]);         sum += m;         tot += a[i] + b[i] - m;       }       if (A + A < tot) {         cout << tot - (A + A) << endl;         for (i = 0; i < n; i++) {           cout << m - min(m, b[i]) <<     << min(m, b[i]) << endl;         }       } else if (B + B < tot) {         cout << tot - (B + B) << endl;         for (i = 0; i < n; i++) {           cout << min(m, a[i]) <<     << m - min(m, a[i]) << endl;         }       } else {         long long togo = A - tot / 2;         cout << (tot & 1) << endl;         for (i = 0; i < n; i++) {           long long x = min(togo, min(m, b[i]));           x = min(x, a[i] - (m - min(m, b[i])));           togo -= x;           cout << m - min(m, b[i]) + x <<     << min(m, b[i]) - x << endl;         }       }     }   }   