View Compilation Error

0_0_11807980_4592.cpp: In function `bool solve()':
0_0_11807980_4592.cpp:5: error: `sscanf' undeclared (first use this function)
0_0_11807980_4592.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11807980_4592.cpp:6: error: `sprintf' undeclared (first use this function)
0_0_11807980_4592.cpp:7: error: `strcmp' undeclared (first use this function)
0_0_11807980_4592.cpp: In function `int main()':
0_0_11807980_4592.cpp:12: error: `gets' undeclared (first use this function)
0_0_11807980_4592.cpp:13: error: `scanf' undeclared (first use this function)
0_0_11807980_4592.cpp:14: error: `getchar' undeclared (first use this function)
0_0_11807980_4592.cpp:16: error: `puts' undeclared (first use this function)