unlockable/DataStructureAndAlgorithm
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unlockable
2023-11-20 19:34:26 +08:00
parent 615133f12a
commit 414e2b676c
2 changed files with 19 additions and 31 deletions
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49
2023205/main.cpp
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@@ -2,21 +2,13 @@
// 并查集。并查集只关注双向连通性。 // 并查集。并查集只关注双向连通性。
struct Edge { struct Edge {
int next;
unsigned short end; unsigned short end;
bool used_in_dfs; bool used_in_dfs;
}; };
Edge edges[1050000]; Edge edges[1050000];
char nodes_visited[65540]; char nodes_visited[65540];
int head[65540], len; int pos[65540];
int add_edge(int start, int terminal) {
edges[++len].end = terminal;
edges[len].next = head[start];
head[start] = len;
return 0;
}
int dfs(int start) { int dfs(int start) {
if (nodes_visited[start] >= 1) { if (nodes_visited[start] >= 1) {
@@ -24,7 +16,7 @@ int dfs(int start) {
return 0; return 0;
} }
nodes_visited[start] = 1; nodes_visited[start] = 1;
for (int j = head[start]; j != 0; j = edges[j].next) { for (int j = pos[start]; j < pos[start + 1]; j++) {
edges[j].used_in_dfs = dfs(edges[j].end); edges[j].used_in_dfs = dfs(edges[j].end);
} }
return 1; return 1;
@@ -36,17 +28,17 @@ int dfs_with_dead_edge(int start, int dead_edge_start, int dead_edge_end) {
} }
nodes_visited[start] = 1; nodes_visited[start] = 1;
if (start == dead_edge_start) { if (start == dead_edge_start) {
for (int j = head[start]; j != 0; j = edges[j].next) { for (int j = pos[start]; j < pos[start + 1]; j++) {
if (edges[j].end == dead_edge_end) { if (edges[j].end == dead_edge_end) {
continue; continue;
} }
dfs(edges[j].end); dfs_with_dead_edge(edges[j].end, dead_edge_start, dead_edge_end);
} }
return 0; return 0;
} }
for (int j = head[start]; j != 0; j = edges[j].next) { for (int j = pos[start]; j < pos[start + 1]; j++) {
dfs(edges[j].end); dfs_with_dead_edge(edges[j].end, dead_edge_start, dead_edge_end);
} }
return 0; return 0;
@@ -55,15 +47,19 @@ int dfs_with_dead_edge(int start, int dead_edge_start, int dead_edge_end) {
int main() { int main() {
int N, M; int N, M;
scanf("%d %d", &N, &M); scanf("%d %d", &N, &M);
int total_edge = 0;
for (int start = 0; start < N; start++) { for (int start = 0; start < N; start++) {
pos[start] = total_edge;
int edge_count; int edge_count;
scanf("%d", &edge_count); scanf("%d", &edge_count);
for (int j = 0; j < edge_count; j++) { for (int j = 0; j < edge_count; j++) {
int terminal; unsigned short terminal;
scanf("%d", &terminal); scanf("%hu", &terminal);
add_edge(start, terminal); edges[pos[start] + j] = Edge{terminal, false};
} }
total_edge += edge_count;
} }
pos[N] = total_edge;
dfs(0); dfs(0);
@@ -79,21 +75,10 @@ int main() {
printf("1\n"); printf("1\n");
// for (int i = 0; i < M; i++) {
// int start, end;
// scanf("%d %d", &start, &end);
// if (nodes_visited[end] == 2) {
// printf("1\n");
// }
// else {
// printf("0\n");
// }
// }
for (int i = 0; i < M; i++) { for (int i = 0; i < M; i++) {
int start, end; int start, end;
scanf("%d %d", &start, &end); scanf("%d %d", &start, &end);
for (int j = head[start]; j != 0; j = edges[j].next) { for (int j = pos[start]; j < pos[start + 1]; j++) {
if (edges[j].end == end) { if (edges[j].end == end) {
if (edges[j].used_in_dfs) { if (edges[j].used_in_dfs) {
for (int k = 0; k < N; k++) { for (int k = 0; k < N; k++) {
@@ -104,14 +89,16 @@ int main() {
bool connected = true; bool connected = true;
for (int k = 0; k < N; k++) { for (int k = 0; k < N; k++) {
if (nodes_visited[k] < 1) { if (nodes_visited[k] < 1) {
printf("0\n");
connected = false; connected = false;
break; break;
} }
} }
if (connected) { if (connected) {
printf("1\n"); printf("1\n");
} }
else {
printf("0\n");
}
} }
else { else {
printf("1\n"); printf("1\n");

1
2023205/testdat.txt
View File

@@ -2,3 +2,4 @@
4 1 1 1 2 2 3 2 1 3 2 1 2 0 1 4 1 1 1 2 2 3 2 1 3 2 1 2 0 1
4 1 1 1 2 2 3 2 1 3 2 1 2 1 2