MLE and WA

2023204/main.cpp

@@ -4,6 +4,8 @@
 // 'Natural count' is the name of the node when all the nodes in the tree is
 // alive. xxx_num denotes the count as the question described.
 
+// SEE ALSO BRANCH 04_02 WITH A CORRECT IMPLEMENTATION 
+
 int ans[200] = {0};
 long long dead_nodes_num[105] = {0};
 int total_dead_nodes = 0;
@@ -16,7 +18,7 @@ struct SeveralContinuedDeadNode {
 };
 
 struct SearchResult {
-    int next_ans_pos;         // pos in the ans[] array.
+    int next_ans_pos;               // pos in the ans[] array.
     long long count_in_father_line; // natural count.
 };
 
@@ -38,7 +40,8 @@ SearchResult find_node(long long target, long long start_num, int next_dead_node
         }
         else {
             all_dead = false;
-            long long total_spawned_after = spawned_node_max_num + upper_line[upper_line_iter].length * 2;
+            long long total_spawned_after =
+                spawned_node_max_num + upper_line[upper_line_iter].length * 2;
             while (dead_nodes_num[next_dead_node_num_ptr] <= total_spawned_after &&
                    next_dead_node_num_ptr < total_dead_nodes) {
                 if (dead_nodes_num[next_dead_node_num_ptr] - spawned_node_max_num > 1) {
@@ -123,26 +126,34 @@ SearchResult find_node(long long target, long long start_num, int next_dead_node
 int main() {
     scanf("%d %d", &total_dead_nodes, &total_target_nodes);
     for (int i = 0; i < total_dead_nodes; i++) {
-        scanf("%d", &dead_nodes_num[i]);
+        scanf("%lld", &dead_nodes_num[i]);
+    }
+    for (int i = 0; i < total_target_nodes; i++) {
+        scanf("%lld", &target_nodes_num[i]);
     }
     if (dead_nodes_num[0] == 1) {
         for (int i = 0; i < total_target_nodes; i++) {
-            printf("0\n");
+            if (target_nodes_num[i] == 1) {
+                printf("1\n");
+                continue;
+            }
+            else {
+                printf("0\n");
+            }
         }
+        return 0;
     }
     else {
-        long long current_target = 0;
         SeveralContinuedDeadNode firstline = SeveralContinuedDeadNode{ALIVE, 1};
         for (int i = 0; i < total_target_nodes; i++) {
-            scanf("%lld", &current_target);
-            SearchResult result = find_node(current_target, 2, 0, &firstline, 1, 2);
+            SearchResult result = find_node(target_nodes_num[i], 2, 0, &firstline, 1, 2);
             if (result.count_in_father_line == -1) {
                 printf("0\n");
             }
             else {
                 printf("1 ");
                 for (int j = result.next_ans_pos - 1; j >= 0; j--) {
-                    printf("%d ", ans[j]);
+                    printf("%lld ", ans[j]);
                 }
                 printf("\n");
             }

2023205/main.cpp

@@ -0,0 +1,71 @@
+#include <stdio.h>
+// 并查集。并查集只关注双向连通性。
+
+struct Edge {
+    unsigned short end;
+    int next;
+};
+
+Edge edges[1050000];
+char nodes_visited[65540];
+int head[65540], len;
+
+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) {
+    if (nodes_visited[start] >= 1) {
+        nodes_visited[start] = 2;
+        return 0;
+    }
+    nodes_visited[start] = 1;
+    for (int j = head[start]; j != 0; j = edges[j].next) {
+        dfs(edges[j].end);
+    }
+    return 0;
+}
+
+int main() {
+    int N, M;
+    scanf("%d %d", &N, &M);
+    for (int start = 0; start < N; start++) {
+        int edge_count;
+        scanf("%d", &edge_count);
+        for (int j = 0; j < edge_count; j++) {
+            int terminal;
+            scanf("%d", &terminal);
+            add_edge(start, terminal);
+        }
+    }
+    
+    dfs(0);
+
+    for (int i  = 0; i < N; i++) {
+        if (nodes_visited[i] < 1) {
+            // Not connected!
+            for (int j = 0; j <= M; j++) {
+                printf("0\n");
+            }
+            return 0;
+        }
+    }
+
+    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");
+        }
+    }
+
+    return 0;
+}