0_0_11868849_6572.cpp: In function `int main()':
0_0_11868849_6572.cpp:15: error: `a' undeclared (first use this function)
0_0_11868849_6572.cpp:15: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11868849_6572.cpp:15: error: `b' undeclared (first use this function)
0_0_11868849_6572.cpp:18: error: `t' undeclared (first use this function)
0_0_11868849_6572.cpp:22: error: invalid operands of types `long long int' and `<unknown type>' to binary `operator-'
0_0_11868849_6572.cpp:22: error: invalid operands of types `<unknown type>' and `int' to binary `operator-'
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