luoguP3480 [POI2009]KAM-Pebbles 阶梯Nim

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将序列差分并翻转之后，变成了阶梯\(Nim\)的模板题

QAQ

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#include <cstdio>
#include <cstring>
#include <iostream>
#include <algorithm>
using namespace std;

#define ll long long
#define ri register int
#define rep(io, st, ed) for(ri io = st; io <= ed; io ++)
#define drep(io, ed, st) for(ri io = ed; io >= st; io --)

#define gc getchar
inline int read() {
	int p = 0, w = 1; char c = gc();
	while(c < '0' || c > '9') { if(c == '-') w = -1; c = gc(); }
	while(c >= '0' && c <= '9') p = p * 10 + c - '0', c = gc();
	return p * w;
}

int n;
int a[20050], d[20050];

int main() {
	int T = read();
	while(T --) {
		int sg = 0;
		n = read();
		rep(i, 1, n) a[i] = read();
		rep(i, 1, n) d[i] = a[i] - a[i - 1];
		for(ri i = n; i >= 1; i -= 2) sg ^= d[i];
		if(sg) printf("TAK\n");
		else printf("NIE\n");
	}
	return 0;
}