Buggy python submission (verdict: Runtime Error):
#!/usr/bin/env python3
import sys
                                                                                                                                                                                                                                                                                                                              def solve(N: int, W: int, w: "List[int]", v: "List[int]"):
    dp=[[0]*(W+1) for _ in range(N+1)]
    for i in range(1, N+1):
        for j in range(1,W+1):
            if j>w[i-1]-1:
                dp[i][j]=max(dp[i-1][j],dp[i-1][j-w[i-1]]+v[i-1])                                                                                                          else:
                dp[i][j]=dp[i-1][j]
    print(dp[N][W])                                                                                                                                                return                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   # Generated by 1.1.6 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():                                                                                                                                              for line in sys.stdin:                                                                                                                                             for word in line.split():                                                                                                                                          yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    W = int(next(tokens))  # type: int
    w = [int()] * (N)  # type: "List[int]"
    v = [int()] * (N)  # type: "List[int]"
    for i in range(N):                                                                                                                                                 w[i] = int(next(tokens))                                                                                                                                       v[i] = int(next(tokens))
    solve(N, W, w, v)                                                                                                                                                                                                                                                                                                         if __name__ == '__main__':
    main()

Fixed submission:
#!/usr/bin/env python3
import sys


def solve(N: int, W: int, w: "List[int]", v: "List[int]"):
    dp=[[0]*(W+1) for _ in range(N+1)]
    for i in range(1, N+1):
        for j in range(1,W+1):
            if j>w[i-1]-1:
                dp[i][j]=max(dp[i-1][j],dp[i-1][j-w[i-1]]+v[i-1])
            else:
                dp[i][j]=dp[i-1][j]
    print(dp[N][W])
    return


# Generated by 1.1.6 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    W = int(next(tokens))  # type: int
    w = [int()] * (N)  # type: "List[int]"
    v = [int()] * (N)  # type: "List[int]"
    for i in range(N):
        w[i] = int(next(tokens))
        v[i] = int(next(tokens))
    solve(N, W, w, v)

if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
#!/usr/bin/env python3
import sys


def solve(N: int, W: int, w: "List[int]", v: "List[int]"):
    dp=[[0]*(W+1) for _ in range(N+1)]
    for i in range(1, N+1):
        for j in range(1,W+1):
            if j>w[i-1]-1:
                dp[i][j]=max(dp[i-1][j],dp[i-1][j-w[i-1]]+v[i-1])
            else:
                dp[i][j]=dp[i-1][j]
    print(dp[N][W])
    return


# Generated by 1.1.6 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    W = int(next(tokens))  # type: int
    w = [int()] * (N)  # type: "List[int]"
    v = [int()] * (N)  # type: "List[int]"
    for i in range(N):
        w[i] = int(next(tokens))
        v[i] = int(next(tokens))
    solve(N, W, w, v)

if __name__ == '__main__':
    main()


Fixed submission:
#!/usr/bin/env python3
import sys


def solve(N: int, W: int, w: "List[int]", v: "List[int]"):
    dp=[[0]*(W+1) for _ in range(N+1)]
    for i in range(1, N+1):
        for j in range(1,W+1):
            if j>w[i-1]-1:
                dp[i][j]=max(dp[i-1][j],dp[i-1][j-w[i-1]]+v[i-1])
            else:
                dp[i][j]=dp[i-1][j]
    print(dp[N][W])
    return


# Generated by 1.1.6 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    W = int(next(tokens))  # type: int
    w = [int()] * (N)  # type: "List[int]"
    v = [int()] * (N)  # type: "List[int]"
    for i in range(N):
        w[i] = int(next(tokens))
        v[i] = int(next(tokens))
    solve(N, W, w, v)

if __name__ == '__main__':
    main()