$O(n+m)$
#include<cstdio> #include<algorithm> int n, m, a[2000000], b[2000000]; int main() { scanf("%d%d", &n, &m); for (int i = 0; i<n + m; i++) scanf("%d", a + i); std::merge(a, a + n, a + n, a + n + m, b); for (int i = 0; i<n + m; i++) printf("%d ", b[i]); return 0; }
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