User Plasmatic

#define getchar() (*_pbuf ? *_pbuf++ : (_buf[fread_unlocked(_pbuf = _buf, 1, 1048576, stdin)] = 0, *_pbuf++))
char _buf[1048577], *_pbuf = _buf;

int readint() {
    int c, o = 0;
    while ((c = getchar()) < '0');
    do {o = (o<<3)+(o<<1) + (c - '0');} while ((c = getchar()) >= '0');
    return o;
}

Note: Eclipse seems to be very fussy about fread_unlocked and doesn't want to admit that it exists

Debug and Scan Template

// Scan and Debug
void scan(){}
template<typename F, typename... R> void scan(F &f,R&... r){cin>>f;scan(r...);}
int di_; string dnms_, co_ = ",";
void debug_(){cout<<endl;}
template<typename F, typename... R> void debug_(F &f, R&... r){while(dnms_[di_] != ',')cout<<dnms_[di_++];di_++;cout<<": "<<f<<",";debug_(r...);}
#define debug(...) dnms_=#__VA_ARGS__+co_,di_=0,debug_(__VA_ARGS__)

Note: The scan requires the cin optimization to work quickly

Note 2: Debug is used like this: debug(x, y, z) where x, y, and z can be variables or expressions

Note 3: Each debug(...) call flushes stdout, so there is no need to call setbuf(stdout, NULL) or similar in case of RTE

The God of Code Templates, from this submission by wleung_bvg

The code is so massive (100 lines long) that I'm putting it on a separate gist

User Plasmatic

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