$O(t(n+m))$
#include<cstdio> #define max(x,y) x>y?x:y; int t; int main() { for (scanf("%d", &t); t--;) { int n, m, x, p = 0, q = 0; scanf("%d%d", &n, &m); while (n--) scanf("%d", &x), p = max(x, p); while (m--) scanf("%d", &x), q = max(x, q); puts(p < q ? "B" : "S"); } return 0; }
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