0_0_3059231_26135.cpp: In function `int main()':
0_0_3059231_26135.cpp:67: error: `at' undeclared (first use this function)
0_0_3059231_26135.cpp:67: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3059231_26135.cpp:67: error: `bt' undeclared (first use this function)
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