0_0_19306061_31636.cpp: In function 'int main()':
0_0_19306061_31636.cpp:26:27: error: 'scanf' was not declared in this scope
while(~scanf("%d%d",&n,&m))
^
0_0_19306061_31636.cpp:46:20: error: 'printf' was not declared in this scope
printf("%d\n",sum);
^
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