#include <cstdio> #include <bitset> const int N = 201800; int main() { int n, v; std::bitset<N> bs; scanf("%d", &n); for (int i = 0; i < n; ++i) { scanf("%d", &v); bs.flip(v); while (!bs.test(v) && v < N) { ++v; bs.flip(v); } } for (int j = N - 1; j >= 0; --j) { if (bs.test(j)) { printf("%d\n", j); return 0; } } }
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | #include <cstdio> #include <bitset> const int N = 201800; int main() { int n, v; std::bitset<N> bs; scanf("%d", &n); for (int i = 0; i < n; ++i) { scanf("%d", &v); bs.flip(v); while (!bs.test(v) && v < N) { ++v; bs.flip(v); } } for (int j = N - 1; j >= 0; --j) { if (bs.test(j)) { printf("%d\n", j); return 0; } } } |