View Compilation Error

0_0_12689982_26988.cpp: In function `int main()':
0_0_12689982_26988.cpp:7: error: `scanf' undeclared (first use this function)
0_0_12689982_26988.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12689982_26988.cpp:9: error: `memset' undeclared (first use this function)
0_0_12689982_26988.cpp:16: error: `next_permutation' undeclared (first use this function)
0_0_12689982_26988.cpp:19: error: `printf' undeclared (first use this function)