0_0_20310527_20570.cpp: In function 'int main()':
0_0_20310527_20570.cpp:16:27: error: 'a' was not declared in this scope
while(~scanf("%d%d", &a, &b))
^
0_0_20310527_20570.cpp:16:31: error: 'b' was not declared in this scope
while(~scanf("%d%d", &a, &b))
^
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