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View Compilation Error

0_0_26636541_19816.cpp:1:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_26636541_19816.cpp: In function 'int main()':
0_0_26636541_19816.cpp:5:40: error: 'scanf' was not declared in this scope
     while(~scanf("%d%d%d%d",&x,&y,&w,&n))
                                        ^
0_0_26636541_19816.cpp:9:26: error: 'printf' was not declared in this scope
         printf("%d\n",sum);
                          ^


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