algorithms/Friends.java at master · a5221985/algorithms · GitHub

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import java.util.*;

class Friends {
    public boolean solve(int n, int[][] friends) {
        BitSet set = new BitSet();
        for (int i = 0; i < friends.length; i++) {
            set.set(friends[i][0]);
            set.set(friends[i][1]);
        }
        System.out.println(set);
        System.out.println(set.cardinality());
        return set.cardinality() == n;
    }

    public static void main(String[] args) {
        Friends f = new Friends();
        int[][] friends = {
                {122, 112},
                {48, 31},
                {7, 59},
		{122, 112},
		{48, 31},
		{7, 59},
		{105, 18},
		{118, 29},
		{120, 61},
		{25, 12},
		{119, 31},
		{82, 52},
		{117, 106},
		{111, 62},
		{98, 97},
		{37, 57},
		{8, 11},
		{116, 41},
		{54, 115},
		{24, 84},
		{68, 40},
		{11, 108},
		{37, 109},
		{15, 11},
		{46, 101},
		{84, 73},
		{93, 92},
		{63, 87},
		{39, 30},
		{18, 1},
		{11, 56},
		{122, 28},
		{78, 112},
		{25, 118},
		{17, 118},
		{0, 14},
		{103, 101},
		{40, 72},
		{123, 112},
		{67, 121},
		{23, 64},
		{3, 59},
		{65, 51},
		{36, 110},
		{47, 30},
		{125, 16},
		{60, 93},
		{106, 88},
		{76, 56},
		{114, 15},
		{4, 32},
		{85, 19},
		{89, 99},
		{18, 122},
		{101, 38},
		{36, 24},
		{82, 51},
		{88, 96},
		{24, 102},
		{74, 28},
		{75, 48},
		{11, 16},
		{25, 33},
		{10, 68},
		{49, 67},
		{93, 118},
		{46, 20},
		{109, 60},
		{103, 45},
		{83, 60},
		{105, 110},
		{39, 44},
		{126, 111},
		{89, 3},
		{102, 43},
		{25, 91},
		{62, 14},
		{23, 93},
		{81, 42},
		{121, 32},
		{124, 71},
		{106, 127},
		{87, 77},
		{16, 74},
		{53, 116},
		{113, 82},
		{21, 84},
		{80, 94},
		{48, 101},
		{115, 77},
		{105, 26},
		{79, 74},
		{65, 13},
		{108, 116},
		{103, 97},
		{29, 85},
		{52, 2},
		{72, 0},
		{62, 33},
		{82, 5},
		{4, 46},
		{39, 33},
		{107, 35},
		{111, 84},
		{127, 32},
		{92, 50},
		{80, 90},
		{115, 59},
		{70, 119},
		{43, 84},
		{67, 86},
		{24, 27},
		{9, 114},
		{22, 82},
		{60, 34},
		{107, 69},
		{16, 104},
		{58, 6},
		{28, 80},
		{58, 117},
		{15, 115},
		{100, 106}
	    };
        int n = 128;
        f.solve(n, friends);
    }
}