0_0_23801004_20753.cpp: In function 'int main()':
0_0_23801004_20753.cpp:4:29: error: 'scanf' was not declared in this scope
while(scanf("%d%d",&x,&y)!=EOF && ((x !=0)||(y != 0)))
^
0_0_23801004_20753.cpp:4:32: error: 'EOF' was not declared in this scope
while(scanf("%d%d",&x,&y)!=EOF && ((x !=0)||(y != 0)))
^
0_0_23801004_20753.cpp:15:50: error: 'printf' was not declared in this scope
printf("%d %d %d %d\n",left,down,right,up);
^
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