HDU 1864 Brave Game 【组合游戏，SG函数】

#include <cstdio>
#include <cstring>

#define N 1002
int n, T, m, sg
;
bool vis
;

int main() {
scanf("%d", &T);
while (T--) {
scanf("%d%d", &n, &m);
sg[0] = 0;
for (int i=1; i<=n; i++) {
memset(vis, false, sizeof(vis));
for (int j=1; j<=m && j<=i; j++) vis[sg[i-j]] = true;
for (int j=0; ; j++) if (!vis[j]) {
sg[i] = j; break;
}
}
puts(sg
? "first" : "second");
}
return 0;
}