View Compilation Error

0_0_1461275_197.cpp: In function `int main()':
0_0_1461275_197.cpp:8: error: `time' undeclared (first use this function)
0_0_1461275_197.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1461275_197.cpp:13: error: `u' undeclared (first use this function)
0_0_1461275_197.cpp:14: error: `d' undeclared (first use this function)