A. Similar String
import sys
def solve():
input = sys.stdin.readline
mod = 10 ** 9 + 7
n = int(input().rstrip('\n'))
s = str(input().rstrip('\n')).replace("1", "l").replace("0", "o")
t = str(input().rstrip('\n')).replace("1", "l").replace("0", "o")
print("Yes" if s == t else "No")
if __name__ == '__main__':
solve()
B. Discord
import sys
def solve():
input = sys.stdin.readline
mod = 10 ** 9 + 7
n, m = list(map(int, input().rstrip('\n').split()))
a = [list(map(int, input().rstrip('\n').split())) for _ in range(m)]
ls = [[False] * n for _ in range(n)]
for i in range(n):
ls[i][i] = True
for i in range(m):
for j in range(1, n):
ls[a[i][j]-1][a[i][j-1]-1] = True
ls[a[i][j-1]-1][a[i][j]-1] = True
cnt = 0
for i in range(n):
for j in range(n):
cnt += 1 if not ls[i][j] else 0
print(cnt // 2)
if __name__ == '__main__':
solve()
C. Dash
import sys
import collections
def solve():
input = sys.stdin.readline
mod = 10 ** 9 + 7
n, m, h, k = list(map(int, input().rstrip('\n').split()))
s = str(input().rstrip('\n'))
d = collections.defaultdict(int)
for i in range(m):
x, y = list(map(int, input().rstrip('\n').split()))
d[x, y] = 1
x, y = 0, 0
for i in range(n):
h -= 1
if h < 0:
print("No")
exit()
if s[i] == "R":
x += 1
if s[i] == "L":
x -= 1
if s[i] == "U":
y += 1
if s[i] == "D":
y -= 1
if d[x, y] == 1:
if h < k:
d[x, y] -= 1
h = k
print("Yes")
if __name__ == '__main__':
solve()
D. Shift vs. CapsLock
import sys
def solve():
input = sys.stdin.readline
mod = 10 ** 9 + 7
x, y, z = list(map(int, input().rstrip('\n').split()))
s = str(input().rstrip('\n'))
dp = [[pow(10, 30)] * (len(s) + 1) for _ in range(2)]
dp[0][0] = 0
for i in range(len(s)):
if s[i] == "a":
dp[0][i+1] = min(dp[0][i+1], dp[0][i] + x, dp[1][i] + z + x)
dp[1][i+1] = min(dp[1][i+1], dp[1][i] + y, dp[0][i] + z + y)
else:
dp[0][i+1] = min(dp[0][i+1], dp[0][i] + y, dp[1][i] + z + y)
dp[1][i+1] = min(dp[1][i+1], dp[1][i] + x, dp[0][i] + z + x)
print(min(dp[0][-1], dp[1][-1]))
if __name__ == '__main__':
solve()