func_code_string: #include <bits/stdc++.h>   using namespace std;   void fio() {}   void pti() {     double timeuse = clock() * 1000.0 / CLOCKS_PER_SEC;     cerr <<  Timeuse   << timeuse <<  ms  << endl;   }   void end() { exit(0); }   namespace io {   const int SIZ = 55;   int que[SIZ], op, qr;   char ch;   template <class I>   inline void gi(I& w) {     ch = getchar(), op = 1, w = 0;     while (!isdigit(ch)) {       if (ch ==  - ) op = -1;       ch = getchar();     }     while (isdigit(ch)) {       w = w * 10 + ch -  0 ;       ch = getchar();     }     w *= op;   }   template <typename T, typename... Args>   inline void gi(T& t, Args&... args) {     gi(t);     gi(args...);   }   template <class I>   inline void print(I w) {     qr = 0;     if (!w) putchar( 0 );     if (w < 0) putchar( - ), w = -w;     while (w) que[++qr] = w % 10 +  0 , w /= 10;     while (qr) putchar(que[qr--]);   }   }  // namespace io   using io::gi;   using io::print;   const int N = 5005;   int n, m;   int a[N];   int main() {     fio();     gi(n, m);     int t = 0;     for (int i = 1; i <= n; ++i) {       a[i] = i;       t += (i - 1) >> 1;       if (t >= m) {         int res = (t - m) << 1;         a[i] += res;         for (int j = n, s = 1e9; j > i; --j, s -= a[i] + 1) a[j] = s;         for (int j = 1; j <= n; ++j) print(a[j]), putchar(   );         end();       }     }     print(-1);     end();   }   