ACM tips (continuously updated)

1. INF

1 const int INF=0x3f3f3f3f;
2 memset(a,0x3f,sizeof a);

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2. In-line space, line end conversion

1 for (int i=0;i<n;i++) {
2     printf("%d%c",arr[i]," \n"[i==n-1]);
3 }

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