#include <stdio.h> struct _Element; typedef struct _Edge { int a; int b; struct _Element *ae; struct _Element *be; } Edge; typedef struct _Element { struct _Element *next; struct _Element *prev; Edge *e; } Element; typedef struct _Node { int id; int nc; Element *ns; } Node; int n; int m; int d; Edge ei[200001]; int elc; Element eli[400002]; Node ni[200001]; int mi[200001]; int mc[200001]; int maxm; int k; int getOther(int node, Element *el) { int a = el->e->a; int b = el->e->b; if (node == a) return b; return a; } void mark(int node, int marker) { int i; int o; Element *el = ni[node].ns; mi[node] = marker; for (i = 0; i < ni[node].nc; ++i) { o = getOther(node, el); if (mi[o] != marker) { mark(o, marker); } el = el->next; } } void addEdge(int e) { int a = ei[e].a - 1; int b = ei[e].b - 1; Element *el = &eli[elc]; elc += 1; el->e = &ei[e]; el->prev = NULL; el->next = ni[a].ns; if (ni[a].ns) ni[a].ns->prev = el; ni[a].ns = el; ni[a].nc += 1; ei[e].ae = el; el = &eli[elc]; elc += 1; el->e = &ei[e]; el->prev = NULL; el->next = ni[b].ns; if (ni[b].ns) ni[b].ns->prev = el; ni[b].ns = el; ni[b].nc += 1; ei[e].be = el; } void removeEdge(Edge *e) { int a = e->a - 1; int b = e->b - 1; Element *el = e->ae; if (el->prev) el->prev->next = el->next; if (el->next) el->next->prev = el->prev; if (el == ni[a].ns) ni[a].ns = el->next; ni[a].nc -= 1; el = e->be; if (el->prev) el->prev->next = el->next; if (el->next) el->next->prev = el->prev; if (el == ni[b].ns) ni[b].ns = el->next; ni[b].nc -= 1; } int solve() { int res = -1; int i; int j; int marker = 0; int removed; int nc; Element *el; for (i = 0; i < n; ++i) { mi[i] = 0; } for (i = 0; i < n; ++i) { if (mi[i] == 0) { marker += 1; mark(i, marker); } } do { removed = 0; // TODO: optimize for (i = 0; i < n; ++i) { if (mi[i] != 0 && ni[i].nc < d) { removed = 1; mi[i] = 0; el = ni[i].ns; nc = ni[i].nc; for (j = 0; j < nc; ++j) { removeEdge(el->e); el = el->next; } } } } while (removed); for (i = 1; i <= marker; ++i) { mc[i] = 0; } for (i = 0; i < n; ++i) { if (mi[i] != 0) { mc[mi[i]] += 1; } } res = mc[1]; maxm = 1; for (i = 1; i < marker; ++i) { if (mc[mi[i]] > res) { res = mc[mi[i]]; maxm = i + 1; } } return res; } int main() { int i; scanf("%d %d %d", &n, &m, &d); for (i = 0; i < n; ++i) { ni[i].id = i; ni[i].nc = 0; ni[i].ns = NULL; } elc = 0; for (i = 0; i < m; ++i) { scanf("%d %d", &ei[i].a, &ei[i].b); addEdge(i); } k = solve(); if (k < 2) { printf("NIE\n"); } else { printf("%d\n", k); for (i = 0; i < n; ++i) { if (mi[i] == maxm) { break; } } printf("%d", i + 1); i += 1; for (; i < n; ++i) { if (mi[i] == maxm) { printf(" %d", i + 1); } } printf("\n"); } 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 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 | #include <stdio.h> struct _Element; typedef struct _Edge { int a; int b; struct _Element *ae; struct _Element *be; } Edge; typedef struct _Element { struct _Element *next; struct _Element *prev; Edge *e; } Element; typedef struct _Node { int id; int nc; Element *ns; } Node; int n; int m; int d; Edge ei[200001]; int elc; Element eli[400002]; Node ni[200001]; int mi[200001]; int mc[200001]; int maxm; int k; int getOther(int node, Element *el) { int a = el->e->a; int b = el->e->b; if (node == a) return b; return a; } void mark(int node, int marker) { int i; int o; Element *el = ni[node].ns; mi[node] = marker; for (i = 0; i < ni[node].nc; ++i) { o = getOther(node, el); if (mi[o] != marker) { mark(o, marker); } el = el->next; } } void addEdge(int e) { int a = ei[e].a - 1; int b = ei[e].b - 1; Element *el = &eli[elc]; elc += 1; el->e = &ei[e]; el->prev = NULL; el->next = ni[a].ns; if (ni[a].ns) ni[a].ns->prev = el; ni[a].ns = el; ni[a].nc += 1; ei[e].ae = el; el = &eli[elc]; elc += 1; el->e = &ei[e]; el->prev = NULL; el->next = ni[b].ns; if (ni[b].ns) ni[b].ns->prev = el; ni[b].ns = el; ni[b].nc += 1; ei[e].be = el; } void removeEdge(Edge *e) { int a = e->a - 1; int b = e->b - 1; Element *el = e->ae; if (el->prev) el->prev->next = el->next; if (el->next) el->next->prev = el->prev; if (el == ni[a].ns) ni[a].ns = el->next; ni[a].nc -= 1; el = e->be; if (el->prev) el->prev->next = el->next; if (el->next) el->next->prev = el->prev; if (el == ni[b].ns) ni[b].ns = el->next; ni[b].nc -= 1; } int solve() { int res = -1; int i; int j; int marker = 0; int removed; int nc; Element *el; for (i = 0; i < n; ++i) { mi[i] = 0; } for (i = 0; i < n; ++i) { if (mi[i] == 0) { marker += 1; mark(i, marker); } } do { removed = 0; // TODO: optimize for (i = 0; i < n; ++i) { if (mi[i] != 0 && ni[i].nc < d) { removed = 1; mi[i] = 0; el = ni[i].ns; nc = ni[i].nc; for (j = 0; j < nc; ++j) { removeEdge(el->e); el = el->next; } } } } while (removed); for (i = 1; i <= marker; ++i) { mc[i] = 0; } for (i = 0; i < n; ++i) { if (mi[i] != 0) { mc[mi[i]] += 1; } } res = mc[1]; maxm = 1; for (i = 1; i < marker; ++i) { if (mc[mi[i]] > res) { res = mc[mi[i]]; maxm = i + 1; } } return res; } int main() { int i; scanf("%d %d %d", &n, &m, &d); for (i = 0; i < n; ++i) { ni[i].id = i; ni[i].nc = 0; ni[i].ns = NULL; } elc = 0; for (i = 0; i < m; ++i) { scanf("%d %d", &ei[i].a, &ei[i].b); addEdge(i); } k = solve(); if (k < 2) { printf("NIE\n"); } else { printf("%d\n", k); for (i = 0; i < n; ++i) { if (mi[i] == maxm) { break; } } printf("%d", i + 1); i += 1; for (; i < n; ++i) { if (mi[i] == maxm) { printf(" %d", i + 1); } } printf("\n"); } return 0; } |