feat(bfs): new problem formated

knight-moves/src/checker.cpp

@@ -0,0 +1,21 @@
+#include "testlib.h"
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main(int argc, char* argv[]) {
+    setName("compare two signed int%d's line by line", 8 * int(sizeof(int)));
+    registerTestlibCmd(argc, argv);
+
+    int T = inf.readInt();  
+
+    for (int t = 0; t < T; t++) {
+        int ja = ans.readInt();
+        int pa = ouf.readInt();
+
+        if (ja != pa)
+            quitf(_wa, "on test %d: expected %d, found %d", t + 1, ja, pa);
+    }
+
+    quitf(_ok, "all answers are correct");
+}