diff --git a/atcoder/abc/abc301-400/abc342/a.py b/atcoder/abc/abc301-400/abc342/a.py
new file mode 100644
index 0000000..6c52e1e
--- /dev/null
+++ b/atcoder/abc/abc301-400/abc342/a.py
@@ -0,0 +1,11 @@
+from collections import defaultdict
+
+s = list(input())
+counter = defaultdict(lambda: 0)
+for si in s:
+    counter[si] += 1
+
+for i in range(1, len(s) + 1):
+    if counter[s[i - 1]] == 1:
+        print(i)
+        exit()
diff --git a/atcoder/abc/abc301-400/abc342/b.py b/atcoder/abc/abc301-400/abc342/b.py
new file mode 100644
index 0000000..d489859
--- /dev/null
+++ b/atcoder/abc/abc301-400/abc342/b.py
@@ -0,0 +1,18 @@
+from collections import defaultdict
+
+n = int(input())
+p_map = defaultdict(lambda: -1)
+p = list(map(int, input().split()))
+for i in range(n):
+    p_map[p[i]] = i + 1
+
+q = int(input())
+ans = []
+for _ in range(q):
+    a, b = map(int, input().split())
+    if p_map[a] < p_map[b]:
+        ans.append(a)
+    else:
+        ans.append(b)
+
+print(*ans, sep="\n")
diff --git a/atcoder/abc/abc301-400/abc342/c.py b/atcoder/abc/abc301-400/abc342/c.py
new file mode 100644
index 0000000..f537b6b
--- /dev/null
+++ b/atcoder/abc/abc301-400/abc342/c.py
@@ -0,0 +1,21 @@
+from collections import defaultdict
+
+n = int(input())
+s = list(input())
+q = int(input())
+cd = []
+mapping_rules = defaultdict(lambda: "")
+for i in range(26):
+    mapping_rules[chr(ord("a") + i)] = chr(ord("a") + i)
+
+for _ in range(q):
+    c, d = input().split()
+    for i in range(26):
+        if mapping_rules[chr(ord("a") + i)] == c:
+            mapping_rules[chr(ord("a") + i)] = d
+
+def mapping(s, mapping_rules):
+    return "".join([mapping_rules[si] for si in s])
+
+ans = mapping(s, mapping_rules)
+print(ans)
diff --git a/atcoder/abc/abc301-400/abc342/d.py b/atcoder/abc/abc301-400/abc342/d.py
new file mode 100644
index 0000000..56bdf67
--- /dev/null
+++ b/atcoder/abc/abc301-400/abc342/d.py
@@ -0,0 +1,54 @@
+from typing import List
+from functools import lru_cache
+from collections import defaultdict
+
+n = int(input())
+a = list(map(int, input().split()))
+
+@lru_cache(maxsize=None)
+def prime_factorize(n: int) -> List[int]:
+    # 素因数分解
+    # Return list of prime factorized result
+    # O(sqrt(n))
+    a = []
+    while n % 2 == 0:
+        a.append(2)
+        n //= 2
+    f = 3
+    while f * f <= n:
+        if n % f == 0:
+            a.append(f)
+            n //= f
+        else:
+            f += 2
+    if n != 1:
+        a.append(n)
+    return a
+
+counter = defaultdict(lambda: 0)
+
+for ai in a:
+    counter_i = defaultdict(lambda: 0)
+    if ai == 0:
+        counter["0"] += 1
+        continue
+
+    for prime in prime_factorize(ai):
+        counter_i[prime] += 1
+        counter_i[prime] %= 2
+
+    str_list = []
+    for k, v in counter_i.items():
+        if v == 1:
+            str_list.append(str(k))
+    counter[" ".join(sorted(str_list))] += 1
+
+ans = 0
+for k, v in counter.items():
+    ans += v * (v - 1) // 2
+
+ans += counter["0"] * (n - counter["0"])
+
+print(ans)
+
+
diff --git a/atcoder/abc/abc301-400/abc342/e.py b/atcoder/abc/abc301-400/abc342/e.py
new file mode 100644
index 0000000..5f6f3f5
--- /dev/null
+++ b/atcoder/abc/abc301-400/abc342/e.py
@@ -0,0 +1,61 @@
+from collections import defaultdict, deque
+import sys
+import heapq
+
+input = lambda: sys.stdin.readline().rstrip()
+sys.setrecursionlimit(20000000)
+INF = float("inf")
+
+n, m = map(int, input().split())
+to_path = defaultdict(lambda: [])
+for _ in range(m):
+    l, d, k, c, a, b = map(int, input().split())
+    to_path[b].append((l, d, k, c, a, b))
+
+def calc_max_ts(l, d, k, c, a, b, ts):
+    # ts: 駅bに到着しているべき時刻
+    # return: 駅aに到着している時刻
+    if ts < l + c:
+        # 終電に間に合う電車が存在しない
+        return -INF
+    elif ts >= l + (k - 1) * d + c:
+        # 最も遅い電車で良い
+        return l + (k - 1) * d
+    else:
+        # 適切なkを探す必要がある
+        ki = (l + (k - 1) * d + c) - ts
+        if ki % d == 0:
+            ki //= d
+        else:
+            ki = ki // d + 1
+        return l + (k - 1 - ki) * d
+
+# Nから逆に辿っていく
+# その駅の終電時刻: max_ts
+max_ts = defaultdict(lambda: -INF)
+q = []
+heapq.heapify(q)
+for l, d, k, c, a, b in to_path[n]:
+    max_ts[b] = max(max_ts[b], l + (k - 1) * d + c)
+heapq.heappush(q, [-max_ts[b], b])
+
+visited = set([])
+while q:
+    current_station = heapq.heappop(q)[1]
+    if current_station in visited:
+        continue
+    visited.add(current_station)
+    for l, d, k, c, a, b in to_path[current_station]:
+        # 選択肢の中から最も遅い電車を選択する
+        tsi = calc_max_ts(l, d, k, c, a, b, max_ts[b])
+        max_ts[a] = max(max_ts[a], tsi)
+        if a not in visited and max_ts[a] != -INF:
+            heapq.heappush(q, [-max_ts[a], a])
+
+ans = []
+for i in range(1, n):
+    if max_ts[i] == -INF:
+        ans.append("Unreachable")
+    else:
+        ans.append(max_ts[i])
+print(*ans, sep="\n")
diff --git a/atcoder/abc/abc301-400/abc342/f.py b/atcoder/abc/abc301-400/abc342/f.py
new file mode 100644
index 0000000..b03560d
--- /dev/null
+++ b/atcoder/abc/abc301-400/abc342/f.py
@@ -0,0 +1,24 @@
+n, l, d = map(int, input().split())
+
+# ブラックジャックの勝率をDPする
+# dp[i][j]: プレイヤーのスコアがi、ディーラーのスコアがjの時の勝率
+# 逆からDPする
+
+dealer_dp = [0] * (n + d + 1)
+player_dp = [0] * (n + 1)
+dealer_dp[0] = 1.0
+
+# dp[i]: ディーラーのスコアがiになる確率
+for i in range(l):
+    for j in range(i + 1, i + 1 + d):
+        dealer_dp[j] += dealer_dp[i] / d
+    dealer_dp[i] = 0.0
+
+for i in range(n):
+    dealer_win_prob = 0.0
+    for j in range(i + 1, n):
+        dealer_win_prob += dealer_dp[j]
+    player_dp[i] = 1.0 - dealer_win_prob
+
+print(dealer_dp)
+print(player_dp)
\ No newline at end of file
diff --git a/atcoder/abc/abc301-400/abc342/g.py b/atcoder/abc/abc301-400/abc342/g.py
new file mode 100644
index 0000000..e69de29