5 cf problems + python stack file fix

Author: naowalrahman

.vscode/settings.json

@@ -5,7 +5,8 @@
         "ostream": "cpp",
         "iostream": "cpp",
         "string": "cpp",
-        "istream": "cpp"
+        "istream": "cpp",
+        "iosfwd": "cpp"
     },
     "C_Cpp.intelliSenseEngineFallback": "Disabled"
 }

codeforces/1632A.cpp

@@ -0,0 +1,16 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(0);
+    int t; cin >> t;
+    while(t--){
+        int n; cin >> n;
+        string s; cin >> s; 
+        if(s == "0" || s == "1" || s == "01" || s == "10") cout << "YES\n"; 
+        else cout << "NO\n";
+    }
+
+    return 0;
+}

codeforces/490A.cpp

@@ -0,0 +1,21 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(0);
+    int n,i,a[4][5050],b[4],c,d;
+	cin>>n;
+	for(i=1;i<=n;i++)
+	{
+		cin>>c;
+		a[c][b[c]++]=i;
+	}
+	d=min(b[1],min(b[2],b[3]));
+	cout<<d<<endl;
+	for(i=0;i<d;i++)
+	{
+		cout<<a[1][i]<<" "<<a[2][i]<<" "<<a[3][i]<<endl;
+	}
+	return 0;
+}

codeforces/59A.cpp

@@ -0,0 +1,22 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(0);
+    string s; cin >> s; 
+    int upper_cnt = 0;
+    int lower_cnt = 0;
+    for(char c : s) {
+        if(isupper(c)) upper_cnt++;
+        else lower_cnt++;
+    }
+    if(upper_cnt > lower_cnt) {
+        transform(s.begin(), s.end(), s.begin(), ::toupper); 
+    }
+    else {
+        transform(s.begin(), s.end(), s.begin(), ::tolower); 
+    }
+    cout << s; 
+    return 0;
+}

codeforces/977A.cpp

@@ -0,0 +1,16 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(0);
+    int n, k; cin >> n >> k;
+
+    for(int i = 0; i < k; i++) {
+        if(n % 10 == 0) n /= 10;
+        else n -= 1;
+    }
+    cout << n;
+
+    return 0;
+}

codeforces/977B.cpp

@@ -0,0 +1,33 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+template<typename KeyType, typename ValueType>
+std::pair<KeyType,ValueType> get_max( const std::map<KeyType,ValueType>& x ) {
+    using pairtype=std::pair<KeyType,ValueType>; 
+    return *std::max_element(x.begin(), x.end(), [] (const pairtype & p1, const pairtype & p2) {
+        return p1.second < p2.second;
+    });
+}
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(0);
+    int n; cin >> n; 
+    string s; cin >> s;
+    vector<string> v;
+
+    for(int i = 0; i < n-1; i++) {
+        string tg = "";
+        tg.push_back(s[i]); tg.push_back(s[i+1]);
+        v.push_back(tg);
+    }
+    map<string, int> counters;
+    for(auto i : v) { 
+        ++counters[i];
+    }
+
+    auto max = get_max(counters);
+    cout << max.first;
+
+    return 0;
+}

cs-article-snippets/stack.py

@@ -23,6 +23,6 @@ def is_empty(self):
             return False 
 
 if __name__ == '__main__': 
-    stack = stack()
+    my_stack = stack()