problems
- https://codeforces.com/problemset/problem/318/A
- https://codeforces.com/problemset/problem/2203/B
- https://codeforces.com/problemset/problem/2200/B
- https://codeforces.com/problemset/problem/2200/C
- https://codeforces.com/problemset/problem/2200/A
- https://codeforces.com/problemset/problem/1374/B
- https://codeforces.com/problemset/problem/1611/A
- https://codeforces.com/problemset/problem/1537/B
- https://codeforces.com/problemset/problem/1535/B
- https://codeforces.com/problemset/problem/1542/A
- https://codeforces.com/problemset/problem/1553/A
- https://codeforces.com/problemset/problem/2203/A
- https://codeforces.com/problemset/problem/2192/A
- https://codeforces.com/problemset/problem/2192/B
- https://codeforces.com/problemset/problem/1878/C
- https://codeforces.com/problemset/problem/1878/A
- https://codeforces.com/problemset/problem/1850/D
- https://codeforces.com/problemset/problem/1850/D
- https://codeforces.com/problemset/problem/1203/C
- https://codeforces.com/problemset/problem/1304/B
- https://codeforces.com/problemset/problem/81/A
- https://codeforces.com/problemset/problem/460/B
- https://codeforces.com/problemset/problem/158/B
- https://codeforces.com/problemset/problem/2014/C
- https://codeforces.com/problemset/problem/267/A
- https://codeforces.com/problemset/problem/2009/E
- https://codeforces.com/problemset/problem/2014/B
- https://codeforces.com/problemset/problem/2014/A
- https://codeforces.com/problemset/problem/230/B
- https://codeforces.com/problemset/problem/1873/E
- https://codeforces.com/problemset/problem/1537/C
- https://codeforces.com/problemset/problem/622/B
- https://codeforces.com/problemset/problem/753/A
- https://codeforces.com/problemset/problem/691/A
- https://codeforces.com/problemset/problem/299/A
- https://codeforces.com/problemset/problem/1931/B
- https://codeforces.com/problemset/problem/102/B
- https://codeforces.com/problemset/problem/58/A
- https://codeforces.com/problemset/problem/691/A
- https://codeforces.com/problemset/problem/1177/A
- https://codeforces.com/problemset/problem/37/A
- https://codeforces.com/problemset/problem/118/A
- https://codeforces.com/problemset/problem/1475/B
- https://codeforces.com/problemset/problem/405/A
- https://codeforces.com/problemset/problem/621/A
- https://codeforces.com/problemset/problem/1225/A
- https://codeforces.com/problemset/problem/52/A
- https://codeforces.com/problemset/problem/914/A
- https://codeforces.com/problemset/problem/1351/B
- https://codeforces.com/problemset/problem/44/A
- https://codeforces.com/problemset/problem/1927/A
- https://codeforces.com/problemset/problem/26/A
- https://codeforces.com/problemset/problem/1878/C
- https://codeforces.com/problemset/problem/1918/A
- https://codeforces.com/problemset/problem/1925/A
- https://codeforces.com/problemset/problem/313/A
- https://codeforces.com/problemset/problem/230/A
- https://codeforces.com/problemset/problem/26/A
- https://codeforces.com/problemset/problem/1475/A
- https://codeforces.com/problemset/problem/1283/A
- https://codeforces.com/problemset/problem/282/A
- https://codeforces.com/problemset/problem/1675/A
- https://codeforces.com/problemset/problem/1843/C
- https://codeforces.com/problemset/problem/1698/A
- https://codeforces.com/problemset/problem/1421/A
- https://codeforces.com/problemset/problem/1676/A
- https://codeforces.com/problemset/problem/200/B
- https://codeforces.com/problemset/problem/1714/A
- https://codeforces.com/problemset/problem/131/A
- https://codeforces.com/problemset/problem/320/A
- https://codeforces.com/problemset/problem/1879/B
- https://codeforces.com/problemset/problem/1529/A
- https://codeforces.com/problemset/problem/1296/B
- https://codeforces.com/problemset/problem/72/G
- https://codeforces.com/problemset/problem/122/A
- https://codeforces.com/problemset/problem/318/A
- https://codeforces.com/problemset/problem/124/A
- https://codeforces.com/problemset/problem/1371/A
- https://codeforces.com/problemset/problem/34/B
- https://codeforces.com/problemset/problem/1878/A
- https://codeforces.com/problemset/problem/580/A
- https://codeforces.com/problemset/problem/160/A
- https://codeforces.com/problemset/problem/1882/A
- https://codeforces.com/problemset/problem/133/A
- https://codeforces.com/problemset/problem/96/A
- https://codeforces.com/problemset/problem/1343/A
- https://codeforces.com/problemset/problem/263/A
- https://codeforces.com/problemset/problem/281/A
- https://codeforces.com/problemset/problem/236/A
- https://codeforces.com/problemset/problem/758/A
- https://codeforces.com/problemset/problem/1742/A
- https://codeforces.com/problemset/problem/1328/A
- https://codeforces.com/problemset/problem/469/A
- https://codeforces.com/problemset/problem/750/A
- https://codeforces.com/problemset/problem/750/A
- https://codeforces.com/problemset/problem/379/A
- https://codeforces.com/problemset/problem/231/A
- https://codeforces.com/problemset/problem/25/A
- https://codeforces.com/problemset/problem/1873/D
- https://codeforces.com/problemset/problem/1873/C
- https://codeforces.com/problemset/problem/1873/B
- https://codeforces.com/problemset/problem/1873/A