func_code_string: #include <bits/stdc++.h>   using namespace std;   int m, n, j, k, l, i, o, p, __t;   int V[200][2000], tim[200][2000], T[200], cop[200][2000];   char ch;   void read(int &a) {     for (ch = getchar(); (ch <  0  || ch >  9 ) && (ch !=  - ); ch = getchar())       ;     if (ch ==  - )       a = 0, __t = -1;     else       a = ch -  0 , __t = 1;     for (ch = getchar(); ch >=  0  && ch <=  9 ; ch = getchar())       a = a * 10 + ch -  0 ;     a *= __t;   }   int main() {     read(m), read(n);     for (int i = 1; i <= m; i++) {       read(T[i]);       for (int j = 1; j <= T[i]; j++)         read(V[i][j]), read(tim[i][j]), cop[i][j] = tim[i][j];     }     int ans = 0;     for (int i = 1; i <= m; i++) {       for (int j = i + 1; j <= m; j++) {         for (int k = 1; k <= T[i]; k++) tim[i][k] = cop[i][k];         for (int k = 1; k <= T[j]; k++) tim[j][k] = cop[j][k];         int x0 = 0, x1 = 0, who = 0;         if (V[i][1] > V[j][1])           who = -1;         else           who = 1;         for (int t1 = 1, t2 = 1; t1 <= T[i] && t2 <= T[j];) {           int dece = min(tim[i][t1], tim[j][t2]);           int y0 = x0 + dece * V[i][t1];           int y1 = x1 + dece * V[j][t2], nexwho;           if (y0 == y1)             nexwho = who;           else if (y0 < y1)             nexwho = 1;           else             nexwho = -1;           if (nexwho != who) ans++;           who = nexwho;           x0 = y0, x1 = y1;           tim[i][t1] -= dece;           tim[j][t2] -= dece;           if (tim[i][t1] == 0) t1++;           if (tim[j][t2] == 0) t2++;         }       }     }     cout << ans << endl;   }   