Add 3 problems from AtCoder Regular Contest 131

Author: leonardoAnjos16

Atcoder/grid_repainting_4.cpp

@@ -0,0 +1,33 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+#define long long long int
+
+int main() {
+    ios_base::sync_with_stdio(false);
+    cin.tie(NULL);
+
+    int H, W;
+    cin >> H >> W;
+
+    vector<string> grid(H);
+    for (int i = 0; i < H; i++)
+        cin >> grid[i];
+
+    for (int i = 0; i < H; i++)
+        for (int j = 0; j < W; j++)
+            if (grid[i][j] == '.')
+                for (char color = '1'; color <= '5'; color++) {
+                    if (i && grid[i - 1][j] == color) continue;
+                    if (i + 1 < H && grid[i + 1][j] == color) continue;
+                    if (j && grid[i][j - 1] == color) continue;
+                    if (j + 1 < W && grid[i][j + 1] == color) continue;
+
+                    grid[i][j] = color;
+                    break;
+                }
+
+    for (int i = 0; i < H; i++)
+        cout << grid[i] << "\n";
+}

Atcoder/two_lucky_numbers.cpp

@@ -0,0 +1,18 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+#define long long long int
+
+int main() {
+    ios_base::sync_with_stdio(false);
+    cin.tie(NULL);
+
+    int A, B;
+    cin >> A >> B;
+
+    string ans = to_string((10 * B) / 2);
+    ans += to_string(A);
+
+    cout << ans << "\n";
+}

Atcoder/zero_xor.cpp

@@ -0,0 +1,29 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+#define long long long int
+
+int main() {
+    ios_base::sync_with_stdio(false);
+    cin.tie(NULL);
+
+    int N; cin >> N;
+
+    int x = 0;
+    vector<int> A(N);
+
+    for (int i = 0; i < N; i++) {
+        cin >> A[i];
+        x ^= A[i];
+    }
+
+    if (N & 1) cout << "Win\n";
+    else {
+        bool win = false;
+        for (int i = 0; i < N && !win; i++)
+            if (A[i] == x) win = true;
+
+        cout << (win ? "Win" : "Lose") << "\n";
+    }
+}