prepare (1/2): 
finished

make (2/2): 
g++ -o c2 main.cpp algo.cpp util.cpp -lgmp -std=c++11 -static
util.cpp: In function 'void char2int(char*, int, __mpz_struct (*)[1])':
util.cpp:10:18: warning: zero-length gnu_printf format string [-Wformat-zero-length]
  sprintf(temp, "");
                  ^
finished

all tasks finished, build successfully