MLE and WA

.clang-format

@@ -77,7 +77,7 @@ BreakConstructorInitializersBeforeComma: false
 BreakConstructorInitializers: BeforeColon
 BreakAfterJavaFieldAnnotations: false
 BreakStringLiterals: true
-ColumnLimit:     80
+ColumnLimit:     100
 CommentPragmas:  '^ IWYU pragma:'
 QualifierAlignment: Leave
 CompactNamespaces: false

2023202/main.cpp

@@ -1,121 +1,47 @@
 #include <stdio.h>
 
-template <class E> class Node {
-private:
-    E content;
-    Node<E> *next;
-
-public:
-    Node(const E &_content) : content(_content), next(this){};
-    Node(const E &_content, Node<E> *nextPtr)
-        : content(_content), next(nextPtr){};
-    void setNext(Node<E> *_ptr) {
-        this->next = _ptr;
-    }
-    E &getContent() {
-        return this->content;
-    }
-    Node<E> *getNextPtr() {
-        return this->next;
-    }
+struct Node{
+    int prev, next;
 };
 
-template <class E> class Iterator {
-private:
-    Node<E> *current;
-
-public:
-    Iterator(Node<E> *start) : current(start){};
-    E &peekNext() {
-        return this->current->getNextPtr()->getContent();
-    }
-    void next() {
-        this->current = this->current->getNextPtr();
-    }
-    E &peek() {
-        return this->current->getContent();
-    }
-    Node<E> *peekNode() {
-        return this->current;
-    }
-    void insertHere(const E &newItem) {
-        this->current->setNext(
-            new Node<E>(newItem, this->current->getNextPtr()));
-    }
-};
-
-template <class E> class List {
-private:
-    // int _length;
-    Node<E> head;
-
-public:
-    List(const E &dummyValue)
-        : head(Node<E>(dummyValue)){
-              // this->_length = 0;
-          };
-    void insert(const E &target, const E &newItem) {
-        Iterator<E> iter = Iterator<E>(&this->head);
-        // Remember to add a loop to stop at length!!;
-        while (iter.peek() != target) {
-            iter.next();
-        }
-        iter.insertHere(newItem);
-        // this->_length++;
-    }
-    void remove(const E &target) {
-        Iterator<E> iter = Iterator<E>(&this->head);
-        while (iter.peekNext() != target) {
-            iter.next();
-        }
-        Node<E> *toBeDeleted = iter.peekNode()->getNextPtr();
-        iter.peekNode()->setNext(toBeDeleted->getNextPtr());
-        delete toBeDeleted;
-        // this->_length--;
-    }
-    Iterator<E> iterate() {
-        return Iterator<E>(&this->head);
-    }
-};
+Node map[100000];
 
 int main() {
-    List<int> aList(0);
-    aList.insert(0, 1);
+    map[0].prev = 1;
+    map[0].next = 1;
+    map[1].prev = 0;
+    map[1].next = 0;
     int n;
     int cmd, x, y;
     scanf("%d", &n);
     while (n) {
         scanf("%d %d", &cmd, &x);
-        switch (cmd) {
-        case 1: {
-            scanf("%d", &y);
-            aList.insert(x, y);
-            break;
-        }
-        case 2: {
-            Iterator<int> iter = aList.iterate();
-            while (iter.peek() != x) {
-                iter.next();
+        switch(cmd) {
+            case 1: {
+                scanf("%d", &y);
+                map[y].prev = x;
+                map[y].next = map[x].next;
+                map[x].next = y;
+                map[map[y].next].prev = y;
+                break;
+            }
+            case 2: {
+                printf("%d\n", map[x].next);
+                break;
+            }
+            case 3: {
+                map[map[x].prev].next = map[x].next;
+                map[map[x].next].prev = map[x].prev;
+                break;
             }
-            printf("%d\n", iter.peekNext());
-            break;
-        }
-        case 3: {
-            aList.remove(x);
-        }
         }
         n--;
     }
 
-    Iterator<int> iter = aList.iterate();
-    iter.next();
-    while (true) {
-        int content = iter.peek();
-        if (content == 0) {
-            break;
-        }
-        printf("%d\n", content);
-        iter.next();
+    int cur = map[0].next;
+    while (cur != 0) {
+        printf("%d\n", cur);
+        cur = map[cur].next;
     }
     return 0;
 }

2023203/main.cpp

@@ -0,0 +1,48 @@
+#include <stdio.h>
+// 创建一个栈，拿到一个数，与栈顶比较，如果比栈顶小，压栈（正在波峰向波谷下降）
+// 比栈顶大，弹栈并计数；和栈顶相同，计数并且压入。
+
+struct NumberNode {
+    int data;
+    int count;
+};
+
+
+long long totalPairs;
+NumberNode powers[500010];
+
+int main() {
+    int len = 1;
+    int N;
+    int input;
+    totalPairs = 0;
+    powers[0].data = 0;
+    powers[0].count = 0;
+    scanf("%d", &N);
+    scanf("%d", &powers[1].data);
+    powers[1].count = 1;
+    N--;
+    for (int i = 0; i < N; i++) {
+        scanf("%d", &input);
+        while (len != 0 && powers[len].data < input) {
+            totalPairs += powers[len].count;
+            len--;
+        }
+        if (len == 0 ) {
+            powers[1].data = input;
+            powers[1].count = 1;
+            len = 1;
+        } else {
+            if (powers[len].data == input) {
+                totalPairs += powers[len].count + (len > 1);
+                powers[len].count++;
+            }
+            else  {
+                totalPairs += 1;
+                powers[++len] = NumberNode {input, 1};
+            }
+        }
+    }
+    printf("%lld", totalPairs);
+    return 0;
+}

2023204/main.cpp

@@ -0,0 +1,164 @@
+#include <stdio.h>
+#define DEAD false
+#define ALIVE true
+// '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;
+long long target_nodes_num[105] = {0};
+int total_target_nodes = 0;
+
+struct SeveralContinuedDeadNode {
+    bool status;
+    long long length; // Caution that when status == dead and length == 1, the node itself is alive.
+};
+
+struct SearchResult {
+    int next_ans_pos;               // pos in the ans[] array.
+    long long count_in_father_line; // natural count.
+};
+
+SearchResult find_node(long long target, long long start_num, int next_dead_node_num_ptr,
+                       SeveralContinuedDeadNode *upper_line, long long upper_line_segment_count,
+                       int layer) {
+    long long spawned_node_max_num = start_num - 1;
+    long long segment_count = upper_line_segment_count;
+    SeveralContinuedDeadNode current_line_node[200] = {0};
+    long long current_line_len = 0;
+    bool all_dead = true;
+
+    // Spawing all the nodes in current line
+    for (int upper_line_iter = 0; upper_line_iter < upper_line_segment_count; upper_line_iter++) {
+        if (upper_line[upper_line_iter].status == DEAD) {
+            current_line_node[current_line_len] = upper_line[upper_line_iter];
+            current_line_node[current_line_len].length *= 2;
+            current_line_len++;
+        }
+        else {
+            all_dead = false;
+            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) {
+                    current_line_node[current_line_len] = SeveralContinuedDeadNode{
+                        ALIVE, dead_nodes_num[next_dead_node_num_ptr] - spawned_node_max_num - 1};
+                    current_line_len++; // things before this new dead node
+                }
+                current_line_node[current_line_len] =
+                    SeveralContinuedDeadNode{DEAD, 1}; // this new dead node
+                current_line_len++;
+
+                spawned_node_max_num = dead_nodes_num[next_dead_node_num_ptr]; // we now spawned to
+                                                                               // this dead node.
+                next_dead_node_num_ptr++;
+            }
+            if (spawned_node_max_num < total_spawned_after) {
+                current_line_node[current_line_len] =
+                    SeveralContinuedDeadNode{ALIVE, total_spawned_after - spawned_node_max_num};
+                current_line_len++;
+            }
+
+            spawned_node_max_num = total_spawned_after;
+        }
+    }
+
+    if (all_dead) {
+        return SearchResult{1, -1};
+    }
+
+    if (target <= spawned_node_max_num) {
+        ans[0] = target;
+        long long natural_pos = -1, num = start_num - 1;
+        for (int i = 0; i < current_line_len; i++) {
+            if (current_line_node[i].status == DEAD) {
+                natural_pos += current_line_node[i].length;
+                num += (current_line_node[i].length == 1);
+                if (num == target) {
+                    return SearchResult{1, natural_pos / 2};
+                }
+                continue;
+            }
+
+            // Now deal with alive nodes
+            if (num + current_line_node[i].length < target) {
+                natural_pos += current_line_node[i].length;
+                num += current_line_node[i].length;
+            }
+            else {
+                // if we made it here, then the target > num + current_line_node[i].length
+                return SearchResult{1, (natural_pos + target - num) / 2};
+            }
+        }
+        return SearchResult{1, -1};
+    }
+    else {
+        SearchResult current_line_pos =
+            find_node(target, spawned_node_max_num + 1, next_dead_node_num_ptr, current_line_node,
+                      current_line_len, layer + 1);
+        if (current_line_pos.count_in_father_line < 0) {
+            // The path does not exist.
+            return SearchResult{1, -1};
+        }
+
+        long long natural_count = -1, num = start_num - 1;
+        for (int i = 0; i < current_line_len; i++) {
+            natural_count += current_line_node[i].length;
+            if (current_line_node[i].status == ALIVE || current_line_node[i].length == 1) {
+                num += current_line_node[i].length;
+            }
+
+            if (natural_count >= current_line_pos.count_in_father_line) {
+                num -= natural_count - current_line_pos.count_in_father_line;
+                ans[current_line_pos.next_ans_pos++] = num;
+                break;
+            }
+        }
+        return SearchResult{current_line_pos.next_ans_pos,
+                            current_line_pos.count_in_father_line / 2};
+    }
+}
+
+int main() {
+    scanf("%d %d", &total_dead_nodes, &total_target_nodes);
+    for (int i = 0; i < total_dead_nodes; 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++) {
+            if (target_nodes_num[i] == 1) {
+                printf("1\n");
+                continue;
+            }
+            else {
+                printf("0\n");
+            }
+        }
+        return 0;
+    }
+    else {
+        SeveralContinuedDeadNode firstline = SeveralContinuedDeadNode{ALIVE, 1};
+        for (int i = 0; i < total_target_nodes; i++) {
+            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("%lld ", ans[j]);
+                }
+                printf("\n");
+            }
+        }
+    }
+
+    return 0;
+}

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;
+}