Buggy python submission (verdict: Runtime Error):
# import bisect
# from collections import Counter, deque, OrderedDict
# from copy import copy, deepcopy
# from functools import reduce
# from heapq import heapify, heappop, heappush
# from itertools import accumulate, permutations, combinations, combinations_with_replacement, groupby, product
# import math
# import numpy as np  # Pythonのみ！
# from operator import xor
# import re
# from scipy.sparse.csgraph import connected_components  # Pythonのみ！
# ↑cf.  https://note.nkmk.me/python-scipy-connected-components/
# from scipy.sparse import csr_matrix
# import string
import sys
sys.setrecursionlimit(10 ** 5 + 10)
def input(): return sys.stdin.readline().strip()

def resolve():
    
    N,w=map(int,input().split())
    W, V = [0] * N, [0] * N
    for i in range(N):
        W [i], V [i] = map(int, input().split())
    
    # 添字を付け加える系DP．ナップサックとかはこの一種
    # https://qiita.com/drken/items/dc53c683d6de8aeacf5a#%E9%A1%9E%E9%A1%8C-3
    
    INF = 10**10  # INF+INFを計算してもオーバーフローしない範囲で大きく
    
    I = N
    # dpテーブル dp[i][j]:=i番目以下で価値j以上の時の，重さの最小値
    J = 100010
    dp = [[0]*(J+1) for _ in range(I+1)]
    # 初期条件
    dp[0][0] = 0
    # ループ
    for i in range(1, I+1):
        for j in range(J+1):
            if j-V[i-1] >= 0:
                dp[i][j] = min(dp[i][j],dp[i-1][j-V[i-1]]+W[i-1])
            else:
                dp[i][j] = min(dp[i][j],dp[i-1][j])
    ans=0
    for j in range(J+1):
        if dp[I][j]<=w:
            ans=j
    print(ans)
    
# resolve()

import sys
from io import StringIO
import unittest

class TestClass(unittest.TestCase):
    def assertIO(self, input, output):
        stdout, stdin = sys.stdout, sys.stdin
        sys.stdout, sys.stdin = StringIO(), StringIO(input)
        resolve()
        sys.stdout.seek(0)
        out = sys.stdout.read()[:-1]
        sys.stdout, sys.stdin = stdout, stdin
        self.assertEqual(out, output)
    def test_入力例_1(self):
        input = """3 8
3 30
4 50
5 60"""
        output = """90"""
        self.assertIO(input, output)
    def test_入力例_2(self):
        input = """1 1000000000
1000000000 10"""
        output = """10"""
        self.assertIO(input, output)
    def test_入力例_3(self):
        input = """6 15
6 5
5 6
6 4
6 6
3 5
7 2"""
        output = """17"""
        self.assertIO(input, output)

if __name__ == "__main__":
    unittest.main()

Fixed submission:
N, W = map(int, input().split())
w, v = [0] * N, [0] * N
for i in range(N):
	w[i], v[i] = map(int, input().split())

V = sum(v)
# dp[i][j]:i番目までの品物から価値がj以上になるよう選んだときの重さの総和の最小値
dp = [[float("inf")] * (V + 1) for _ in range(N + 1)]
dp[0][0] = 0
for i in range(N):
	for j in range(V + 1):
		# i+1番目を選ぶ場合
		if j - v[i] >= 0:
			dp[i + 1][j] = min(dp[i + 1][j], dp[i][j - v[i]] + w[i])
		# i+1番目を選ばない場合
		dp[i + 1][j] = min(dp[i + 1][j], dp[i][j])

# dp[N][j]がW以下であるようなjの最大値が答えになる
ans = 0
for j in range(V + 1):
	if dp[N][j] <= W:
		ans = j

print(ans)

Buggy python submission (verdict: Runtime Error):
# import bisect
# import copy
# import fractions
# import math
# import numpy as np
# from collections import Counter, deque
# from itertools import accumulate,permutations, combinations,combinations_with_replacement,product

def resolve():
    N, W = map(int, input().split())
    weight, value = [0] * N, [0] * N
    for i in range(N):
        weight[i], value[i] = map(int, input().split())


    # この前段階で、荷物の数N、ウェイトの上限W、
    # weightの表weightとvalueの表valueは用意しておく。
    def knapsack(N, W, weight, value):
        dp = [[0] * (W + 1) for _ in range(N + 1)]

        for i in range(N):
            for w in range(W + 1):
                if w >= weight[i]:  # 荷物が加わる可能性がある
                    # max関数の第一引数だと、既存の荷物の方がましな場合。
                    # 第二引数だと、新入りを加えた方が良い場合。
                    dp[i + 1][w] = max(dp[i][w], dp[i][w - weight[i]] + value[i])
                else:  # 加わる可能性はない
                    dp[i + 1][w] = dp[i][w]

        return dp[N][W]

    print(knapsack(N, W, weight, value))


resolve()

Fixed submission:
N, W = map(int, input().split())
w, v = [0] * N, [0] * N
for i in range(N):
	w[i], v[i] = map(int, input().split())

V = sum(v)
# dp[i][j]:i番目までの品物から価値がj以上になるよう選んだときの重さの総和の最小値
dp = [[float("inf")] * (V + 1) for _ in range(N + 1)]
dp[0][0] = 0
for i in range(N):
	for j in range(V + 1):
		# i+1番目を選ぶ場合
		if j - v[i] >= 0:
			dp[i + 1][j] = min(dp[i + 1][j], dp[i][j - v[i]] + w[i])
		# i+1番目を選ばない場合
		dp[i + 1][j] = min(dp[i + 1][j], dp[i][j])

# dp[N][j]がW以下であるようなjの最大値が答えになる
ans = 0
for j in range(V + 1):
	if dp[N][j] <= W:
		ans = j

print(ans)

Buggy python submission (verdict: Runtime Error):
# import bisect
# import copy
# import fractions
# import math
# import numpy as np
# from collections import Counter, deque
# from itertools import accumulate,permutations, combinations,combinations_with_replacement,product

def resolve():
    N,W=map(int,input().split())
    weight,value=[],[]
    for i in range(N):
        w,v=map(int,input().split())
        weight.append(w)
        value.append(v)
    # この前段階で、荷物の数N、ウェイトの上限W、
    # weightの表weightとvalueの表valueは用意しておく。
    def knapsack(N, W, weight, value):
        dp = [[0] * (W + 1) for _ in range(N + 1)]

        for i in range(N):
            for w in range(W + 1):
                if w >= weight[i]:  # 荷物が加わる可能性がある
                    # max関数の第一引数だと、既存の荷物の方がましな場合。
                    # 第二引数だと、新入りを加えた方が良い場合。
                    dp[i + 1][w] = max(dp[i][w], dp[i][w - weight[i]] + value[i])
                else:  # 加わる可能性はない
                    dp[i + 1][w] = dp[i][w]

        return dp[N][W]

    print(knapsack(N,W,weight,value))

resolve()

Fixed submission:
N, W = map(int, input().split())
w, v = [0] * N, [0] * N
for i in range(N):
	w[i], v[i] = map(int, input().split())

V = sum(v)
# dp[i][j]:i番目までの品物から価値がj以上になるよう選んだときの重さの総和の最小値
dp = [[float("inf")] * (V + 1) for _ in range(N + 1)]
dp[0][0] = 0
for i in range(N):
	for j in range(V + 1):
		# i+1番目を選ぶ場合
		if j - v[i] >= 0:
			dp[i + 1][j] = min(dp[i + 1][j], dp[i][j - v[i]] + w[i])
		# i+1番目を選ばない場合
		dp[i + 1][j] = min(dp[i + 1][j], dp[i][j])

# dp[N][j]がW以下であるようなjの最大値が答えになる
ans = 0
for j in range(V + 1):
	if dp[N][j] <= W:
		ans = j

print(ans)