Finished c and d, e doesn't check for faulty arrangements

atcoder/beginner_contests/226/c.cpp

@@ -2,23 +2,58 @@
 
 using namespace std;
 
-void test_case(int tc){
+typedef long long ll;
 
+set<int> learnedMoves;
+vector<pair<ll, vector<int>>> movelist;
+ll result = 0;
+
+void handleMove(int move){
+    auto s = learnedMoves.size();
+    learnedMoves.insert(move);
+
+    if(s == learnedMoves.size()){
+        return;
+    }
+
+    result += movelist[move - 1].first;
+    for(int neededMove : movelist[move - 1].second){
+        handleMove(neededMove);
+    }
 }
 
-
-
 int main(){
     ios::sync_with_stdio(0);
     cin.tie(0);
 
-    int t;
+    int n;
-    cin >> t;
+    cin >> n;
 
-    for(int tc = 1; tc <= t; ++tc){
+    movelist.reserve(n);
-        test_case(tc);
+
+    for(int i = 0; i < n; ++i){
+        ll t;
+        int k;
+
+        cin >> t >> k;
+
+        vector<int> neededMoves(k);
+
+        for(int j = 0; j < k; ++j){
+            cin >> neededMoves[j];
+        }
+        movelist[i].first = t;
+        movelist[i].second = neededMoves;
     }
 
+    result += movelist[n - 1].first;
+
+    for(int move : movelist[n - 1].second){
+        handleMove(move);
+    }
+
+    cout << result;
+
     cout << flush;
 
     return 0;

atcoder/beginner_contests/226/d.cpp

@@ -2,23 +2,57 @@
 
 using namespace std;
 
-void test_case(int tc){
+typedef long long ll;
 
+set<pair<ll, ll>> spells;
+
+ll gcd(ll a, ll b){
+    if(b == 0){
+        return a;
+    }
+
+    return gcd(b, a % b);
 }
 
-
-
 int main(){
     ios::sync_with_stdio(0);
     cin.tie(0);
 
-    int t;
+    int n;
-    cin >> t;
+    cin >> n;
 
-    for(int tc = 1; tc <= t; ++tc){
+    vector<pair<ll, ll>> cities(n);
-        test_case(tc);
+
+    for(int i = 0; i < n; ++i){
+        ll x, y;
+
+        cin >> x >> y;
+        cities[i] = {x, y};
+
+        for(int j = 0; j < i; ++j){
+            ll dx = cities[j].first - cities[i].first;
+            ll dy = cities[j].second - cities[i].second;
+
+            if(dx == 0){
+                spells.insert({0, 1});
+                spells.insert({0,-1});
+            } else if(dy == 0){
+                spells.insert({1,0});
+                spells.insert({-1, 0});
+            } else{
+                ll g = gcd(dx, dy);
+
+                dx /= g;
+                dy /= g;
+
+                spells.insert({dx, dy});
+                spells.insert({-1*dx, -1*dy});
+            }
+        }
     }
 
+    cout << spells.size();
+
     cout << flush;
 
     return 0;

atcoder/beginner_contests/226/e.cpp

@@ -2,23 +2,53 @@
 
 using namespace std;
 
-void test_case(int tc){
+vector<bool> visitedNodes;
+vector<vector<int>> edgeList;
 
+void dfs(int start){
+    visitedNodes[start] = true;
+
+    for(int node : edgeList[start]){
+        if(!visitedNodes[node]){
+            dfs(node);
+        }
+    }
 }
 
-
-
 int main(){
     ios::sync_with_stdio(0);
     cin.tie(0);
 
-    int t;
+    int n, m;
-    cin >> t;
+    cin >> n >> m;
 
-    for(int tc = 1; tc <= t; ++tc){
+    if(n != m){
-        test_case(tc);
+        cout << 0 << endl;
+        return 0;
     }
 
+    visitedNodes.reserve(n+1);
+    edgeList.reserve(n+1);
+
+    for(int i = 1; i <= m; ++i){
+        int u, v;
+        cin >> u >> v;
+
+        edgeList[u].push_back(v);
+    }
+
+    long long result = 1;
+
+    for(int start = 1; start <= n; ++start){
+        if(!visitedNodes[start]){
+            result = (result * 2) % 998244353;
+
+            dfs(start);
+        }
+    }
+
+    cout << result;
+
     cout << flush;
 
     return 0;