0_0_19780448_13802.cpp: In function 'int main()':
0_0_19780448_13802.cpp:5:35: error: 'n' was not declared in this scope
while(scanf("%d%d",&a,&b)!=EOF&&(n||m))
^
0_0_19780448_13802.cpp:5:38: error: 'm' was not declared in this scope
while(scanf("%d%d",&a,&b)!=EOF&&(n||m))
^
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