func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, k[110], v[110][110], t[110][110], res, s, i, j;   int ktra(long long &s1, long long &s2, long long f1, long long f2, int &p) {     int res = ((s1 - s2) * (f1 - f2) < 0) || ((s1 == s2) && (p * (f1 - f2) < 0));     if (f1 > f2) p = 1;     if (f1 < f2) p = -1;     s1 = f1;     s2 = f2;     return res;   }   int tinh(int i, int j) {     long long s1 = 0, s2 = 0;     int i1 = 0, i2 = 0, t1 = t[i][0], t2 = t[j][0], d = 0, tt, p = 0;     while (s1 < s && s2 < s) {       tt = min(t1, t2);       d += ktra(s1, s2, s1 + tt * v[i][i1], s2 + tt * v[j][i2], p);       t1 -= tt;       t2 -= tt;       if (t1 == 0 && i1 < k[i] - 1) t1 = t[i][++i1];       if (t2 == 0 && i2 < k[j] - 1) t2 = t[j][++i2];     }     return d;   }   int main() {     cin >> n >> s;     for (i = 0; i < n; i++) {       cin >> k[i];       for (j = 0; j < k[i]; j++) cin >> v[i][j] >> t[i][j];     }     res = 0;     for (i = 0; i < n - 1; i++)       for (j = i + 1; j < n; j++) res += tinh(i, j);     cout << res;   }   