Add 21It4 Java

21IT4-CPP/14_02/Ex01.cpp

@@ -0,0 +1,12 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main() {
+    int n;
+    cin >> n;
+    if (n % 2 == 0)
+        cout << "YES";
+    else
+        cout << "NO";
+}

21IT4-CPP/14_02/Ex02.cpp

@@ -0,0 +1,12 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main() {
+    int n;
+    cin >> n;
+    if (n >= 100 && n <= 999)
+        cout << "YES";
+    else
+        cout << "NO";
+}

21IT4-CPP/14_02/Ex03.cpp

@@ -0,0 +1,14 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main() {
+    float n;
+    cin >> n;
+    int k = int(n);
+
+    if (n == k)
+        cout << "YES";
+    else
+        cout << "NO";
+}

21IT4-CPP/14_02/Ex04.cpp

@@ -0,0 +1,15 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main() {
+    long long a, b, c;
+    cin >> a >> b >> c;
+    long long max = a;
+    if (max < b)
+        max = b;
+    if (max < c)
+        max = c;
+
+    cout << max;
+}

21IT4-CPP/14_02/Ex05.cpp

@@ -0,0 +1,11 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int main()
+{
+    long long a, b;
+    cin >> a >> b;
+    long long sum;
+    sum = ((a+b)*(b-a+1))/2;
+    cout << sum;
+}

21IT4-CPP/14_02/Ex06.cpp

@@ -0,0 +1,10 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main(){
+    int n;
+    cin >> n;
+    for (int i = 1; i <= 10; i++) 
+        cout << n << " x " << i << " = " << n * i << endl;
+}

21IT4-CPP/14_02/Ex07.cpp

@@ -0,0 +1,17 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int a[100000];
+
+int main(){
+    int n;
+    cin >> n;
+    for (int i = 0; i < n; i++)
+        cin >> a[i];
+
+    sort(a, a + n);
+
+    for (int i = 0; i < n; i++)
+        cout << a[i] << " ";
+}

21IT4-CPP/14_02/Ex08.cpp

@@ -0,0 +1,24 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int a[100009];
+
+int main(){
+    int n;
+    cin >> n;
+    for (int i = 0; i < n; i++)
+        cin >> a[i];
+
+    sort(a, a + n);
+
+    // for (int i = 0; i < n; i++)
+    //     cout << a[i] << " ";
+
+    int count = 1;
+    for (int i = 1; i < n; i++)
+        if (a[i] != a[i - 1])
+            count++;
+
+    cout << count;
+}

21IT4-CPP/14_02/Ex09.cpp

@@ -0,0 +1,13 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main() {
+    string s;
+    getline(cin, s);
+    for (int i = 0; i < s.length(); i++) {
+        if (s[i]>='a' && s[i]<='z')
+            s[i] -= 32;
+    }
+    cout << s;
+}

21IT4-CPP/14_02/ThiVong2.cpp

@@ -0,0 +1,40 @@
+#include <iostream>
+#include <cmath>
+using namespace std;
+
+int main() {
+	int n,k;
+	cin>>n>>k;
+
+	int a[n];
+
+	for (int i =0;i<n;i++){
+		cin >>a[i];
+	}
+
+	for(int i =0;i<n;i++){
+		for(int j = i+1 ;j<n;j++){
+			if(a[i] < a[j]){
+				swap(a[i],a[j]);
+			}
+		}
+	}	
+	int dem =0;
+	int hang=0;
+	int t=0;
+	for(int i =0;i<n;i++){
+
+		if(a[i]!=0){
+			t=t+a[i];
+			dem++;
+			hang++;
+		}
+
+		if(hang >= k){
+			break;
+		}
+	}
+	if(t==0) cout<<"0";
+	else
+	cout <<dem;
+}

21IT4-CPP/14_02/tempCodeRunnerFile.cpp

@@ -0,0 +1,2 @@
+ < n; i++)
+    //     cout << a[i] << " ";

21IT4-CPP/21IT4/Ex01.cpp

@@ -0,0 +1,13 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main() {
+    long long n;
+    cin >> n;
+
+    if (n >= 10 && n <= 99)
+        cout << "YES";
+    else
+        cout << "NO";
+}

21IT4-CPP/21IT4/Ex02.cpp

@@ -0,0 +1,18 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main() {
+    long long n;
+    cin >> n;
+    // n = 123
+    int sum = 0;
+
+    while (n > 0) {
+        int d = n % 10;
+        sum = sum + d;
+        n = n / 10;
+    }
+
+    cout << sum;
+}

21IT4-CPP/21IT4/Ex03.cpp

@@ -0,0 +1,15 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+long long sum(long long n) {
+    return n * (n + 1) / 2;
+}
+
+int main() {
+    long long a, b;
+    cin >> a >> b;
+    cout << sum(b) - sum(a - 1);
+}
+
+// 1 2 3 ... a-1   a ... b

21IT4-CPP/21IT4/Ex04.cpp

@@ -0,0 +1,10 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main() {
+    long long a;
+    cin >> a;
+    long long sum = a * (a + 1) / 2;
+    cout << sum;
+}

21IT4-CPP/21IT4/Ex05.cpp

@@ -0,0 +1,16 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int a[100009];
+
+int main() {
+    int n;
+    cin >> n;
+    for (int i = 0; i < n; i++)
+        cin >> a[i];
+
+    for (int i = 0; i < n; i++)
+        if (a[i] % 2 == 0 && i % 2 == 1)
+            cout << a[i] << endl;
+}

21IT4-CPP/21IT4/SapXepMang.cpp

@@ -0,0 +1,17 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int a[100009];
+
+int main() {
+    int n;
+    cin >> n;
+    for (int i = 0; i < n; i++)
+        cin >> a[i];
+
+    sort(a, a + n);
+
+    for (int i = 0; i < n; i++)
+        cout << a[i] << " ";
+}

21IT4-CPP/21IT4/SapXepMang2Chieu.cpp

@@ -0,0 +1,49 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int a[1009][1009];
+int b[1000009];
+
+int main() {
+    int m, n;
+    cin >> m >> n;
+    for (int i = 0; i < m; i++) {
+        for (int j = 0; j < n; j++) {
+            cin >> a[i][j];
+        }
+    }
+
+    // chuyen mang 2 chieu ve mang 1 chieu
+    int index = 0;
+    for (int i = 0; i < m; i++) {
+        for (int j = 0; j < n; j++) {
+            b[index] = a[i][j];
+            index = index + 1;
+        }
+    }
+
+    // sap xep mang 1 chieu
+    sort(b, b + m * n);
+
+    // for (int i = 0; i < m * n; i++)
+    //     cout << b[i] << " ";
+
+    // Dua mang 1 chieu da sap xep ve mang 1 chieu
+    index = 0;
+    for (int i = 0; i < m; i++) {
+        for (int j = 0; j < n; j++) {
+            a[i][j] = b[index];
+            index = index + 1;
+        }
+    }
+
+    cout << "Mang sau khi da sap xep" << endl;
+
+    for (int i = 0; i < m; i++) {
+        for (int j = 0; j < n; j++) {
+            cout << a[i][j] << " ";
+        }
+        cout << endl;
+    }
+}

21IT4-CPP/21IT4/XuongDong.cpp

@@ -0,0 +1,24 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main() {
+    string s;
+    getline(cin, s);
+
+    bool check = false;
+
+    for (int i = 0; i < s.length(); i++)
+        if (s[i] == ' ')
+            check = true;
+
+    if (check == false || s.length() > 100)
+        cout << "N";
+    else {
+        for (int i = 0; i < s.length(); i++)
+        if (s[i] == ' ')
+            cout << endl;
+        else
+            cout << s[i];
+    }
+}

21IT4-CPP/21IT4/mang2chieu.cpp

@@ -0,0 +1,22 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int a[1009][1009];
+
+int main() {
+    int m, n;
+    cin >> m >> n;
+    for (int i = 0; i < m; i++) {
+        for (int j = 0; j < n; j++) {
+            cin >> a[i][j];
+        }
+    }
+
+    for (int i = 0; i < m; i++) {
+        for (int j = 0; j < n; j++) {
+            cout << a[i][j] << " ";
+        }
+        cout << endl;
+    }
+}

21IT4-CPP/21IT4/tempCodeRunnerFile.cpp

@@ -0,0 +1,2 @@
+ i < m * n; i++)
+    //     cout << b[i] << " ";