Buggy python submission (verdict: Time Limit Exceeded):
import math
import fractions
import bisect
import collections
import itertools
import heapq
import string
import sys
import copy
from collections import deque
sys.setrecursionlimit(10**7)
MOD = 10**9+7
def gcd(a,b):return fractions.gcd(a,b) #最大公約数
def lcm(a,b):return (a*b) // fractions.gcd(a,b) #最小公倍数
def iin(): return int(input()) #整数読み込み
def ifn(): return float(input()) #浮動小数点読み込み
def isn(): return input().split() #文字列読み込み
def imn(): return map(int, input().split()) #整数map取得
def fmn(): return map(float, input().split()) #浮動小数点map取得
def iln(): return list(map(int, input().split())) #整数リスト取得
def iln_s(): return sorted(iln()) # 昇順の整数リスト取得
def iln_r(): return sorted(iln(), reverse=True) # 降順の整数リスト取得
def fln(): return list(map(float, input().split())) # 浮動小数点リスト取得
def join(l, s=''): return s.join(l) #リストを文字列に変換
def perm(l, n): return itertools.permutations(l, n) # 順列取得
def perm_count(n, r): return math.factorial(n) // math.factorial(n-r) # 順列の総数
def comb(l, n): return itertools.combinations(l, n) # 組み合わせ取得
def comb_count(n, r): return math.factorial(n) // (math.factorial(n-r) * math.factorial(r)) #組み合わせの総数
def two_distance(a, b, c, d): return ((c-a)**2 + (d-b)**2)**.5 # 2点間の距離
def m_add(a,b): return (a+b) % MOD

N, W = imn()
wv = [iln() for _ in range(N)]

dp = [0 for _ in range(W+1)]

for i in range(N):
    for w in range(W, -1,  -1):
        if w - wv[i][0] >= 0: dp[w] = max(dp[w], dp[w-wv[i][0]]+wv[i][1])
print(dp[W])

Fixed submission:
N,W = map(int, input().split())
wv = [list(map(int, input().split())) for _ in range(N)]

dp = [[0 for _ in range(W+1)] for _ in range(N+1)] 

dp[0][0] = 0

for i in range(N):
    weight = wv[i][0]
    for j in range(W+1):
        dp[i+1][j] = dp[i][j]
        if j >= weight:
            dp[i+1][j] = max(dp[i+1][j], dp[i][j-weight] + wv[i][1])
print(dp[N][W])

Buggy python submission (verdict: Time Limit Exceeded):
import math
import fractions
import bisect
import collections
import itertools
import heapq
import string
import sys
import copy
from collections import deque
sys.setrecursionlimit(10**7)
def gcd(a,b):return fractions.gcd(a,b) #最大公約数
def lcm(a,b):return (a*b) // fractions.gcd(a,b) #最小公倍数
def iin(): return int(input()) #整数読み込み
def isn(): return input().split() #文字列読み込み
def imn(): return map(int, input().split()) #整数map取得
def iln(): return list(map(int, input().split())) #整数リスト取得
def iln_s(): return sorted(iln()) # 昇順の整数リスト取得
def iln_r(): return sorted(iln(), reverse=True) # 降順の整数リスト取得
def join(l, s=''): return s.join(l) #リストを文字列に変換
def perm(l, n): return itertools.permutations(l, n) # 順列取得
def perm_count(n, r): return math.factorial(n) // math.factorial(n-r) # 順列の総数
def comb(l, n): return itertools.combinations(l, n) # 組み合わせ取得
def comb_count(n, r): return math.factorial(n) // (math.factorial(n-r) * math.factorial(r)) #組み合わせの総数

N,W = imn()
wv = [iln() for _ in range(N)]

dp = [[0 for _ in range(W+1)] for _ in range(N+1)]

for i in range(N):
    for sum_w in range(0,W+1):
        if (sum_w - wv[i][0]) >= 0: 
            dp[i+1][sum_w] = max(dp[i+1][sum_w], dp[i][sum_w-wv[i][0]]+wv[i][1]) 

        dp[i+1][sum_w] = max(dp[i+1][sum_w], dp[i][sum_w])

print(dp[N][W])


Fixed submission:
N,W = map(int, input().split())
wv = [list(map(int, input().split())) for _ in range(N)]

dp = [[0 for _ in range(W+1)] for _ in range(N+1)] 

dp[0][0] = 0

for i in range(N):
    weight = wv[i][0]
    for j in range(W+1):
        dp[i+1][j] = dp[i][j]
        if j >= weight:
            dp[i+1][j] = max(dp[i+1][j], dp[i][j-weight] + wv[i][1])
print(dp[N][W])

Buggy python submission (verdict: Time Limit Exceeded):
N,W = map(int, input().split())
wv = [list(map(int, input().split())) for _ in range(N)]

dp = [[0 for _ in range(W+1)] for _ in range(N+1)] 

dp[0][0] = 0

for i in range(N):
    weight = wv[i][0]
    for j in range(W+1):
        dp[i+1][j] = dp[i][j]
        if j >= weight:
            dp[i+1][j] = max(dp[i+1][j], dp[i][j-weight] + wv[i][1])
print(dp[N][W])

Fixed submission:
N,W = map(int, input().split())
wv = [list(map(int, input().split())) for _ in range(N)]

dp = [[0 for _ in range(W+1)] for _ in range(N+1)] 

dp[0][0] = 0

for i in range(N):
    weight = wv[i][0]
    for j in range(W+1):
        dp[i+1][j] = dp[i][j]
        if j >= weight:
            dp[i+1][j] = max(dp[i+1][j], dp[i][j-weight] + wv[i][1])
print(dp[N][W])