View Compilation Error

0_0_9051181_25998.cpp: In function `void length()':
0_0_9051181_25998.cpp:19: error: `left' undeclared (first use this function)
0_0_9051181_25998.cpp:19: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9051181_25998.cpp:27: error: `right' undeclared (first use this function)
0_0_9051181_25998.cpp: In function `uint64_t largestRect()':
0_0_9051181_25998.cpp:42: error: `left' undeclared (first use this function)
0_0_9051181_25998.cpp:42: error: `right' undeclared (first use this function)