View Compilation Error

0_0_4246087_6050.cpp: In function `int main()':
0_0_4246087_6050.cpp:50: error: `time' undeclared (first use this function)
0_0_4246087_6050.cpp:50: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4246087_6050.cpp:50: error: `m' undeclared (first use this function)
0_0_4246087_6050.cpp:50: error: `n' undeclared (first use this function)
0_0_4246087_6050.cpp:54: error: `x' undeclared (first use this function)
0_0_4246087_6050.cpp:54: error: `y' undeclared (first use this function)
0_0_4246087_6050.cpp:54: error: `DP' undeclared (first use this function)