View Compilation Error

0_0_9138136_4020.cpp: In function `long long int cost(long long int, long long int, long long int)':
0_0_9138136_4020.cpp:22: error: `min' undeclared (first use this function)
0_0_9138136_4020.cpp:22: error: (Each undeclared identifier is reported only once for each function it appears in.)