Buggy python submission (verdict: Time Limit Exceeded):
import sys
import collections
import numpy as np
e=sys.stdin.readlines()
N,M,Q=map(int,e[0].split())
dp=np.zeros([N+1,N+1])
for k,c in collections.Counter(e[1:M+1]).items():
    L,R=map(int,k.split())
    dp[1:L+1,R:N+1] += c
ans=''
for x in e[M+1:]:
    p,q=map(int,x.split())
    ans+=str(int(dp[p][q]))+'\n'
print(ans[:-1])

Fixed submission:
import sys
def main():
    s = sys.stdin.readlines()
    N, M, Q = map(int, s[0].split())
    x = [[0] * N for _ in [0] * N]
    for e in s[1:M + 1]:
        L, R = map(int, e.split())
        x[L - 1][R - 1] += 1
    for k in range(1, N):
        for i in range(N - k):
            j = i + k
            x[i][j] += x[i][j - 1] + x[i + 1][j] - x[i + 1][j - 1]
    res = []
    for e in s[M + 1:]:
        p, q = map(int, e.split())
        res.append(x[p - 1][q - 1])
    print('\n'.join(map(str, res)))
if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
import sys
import collections
e=sys.stdin.readlines()
N,M,Q=map(int,e[0].split())
dp=[[0]*-~N for _ in[0]*-~N]
for k,c in collections.Counter(e[1:M+1]).items():
    L,R=map(int,k.split())
    for i in range(1,L+1):
        for j in range(R,N+1):
            dp[i][j] += c
ans=''
for x in e[M+1:]:
    p,q=map(int,x.split())
    ans+=str(dp[p][q])+'\n'
print(ans[:-1])

Fixed submission:
import sys
def main():
    s = sys.stdin.readlines()
    N, M, Q = map(int, s[0].split())
    x = [[0] * N for _ in [0] * N]
    for e in s[1:M + 1]:
        L, R = map(int, e.split())
        x[L - 1][R - 1] += 1
    for k in range(1, N):
        for i in range(N - k):
            j = i + k
            x[i][j] += x[i][j - 1] + x[i + 1][j] - x[i + 1][j - 1]
    res = []
    for e in s[M + 1:]:
        p, q = map(int, e.split())
        res.append(x[p - 1][q - 1])
    print('\n'.join(map(str, res)))
if __name__ == '__main__':
    main()

Buggy python submission (verdict: Runtime Error):
import sys
import collections
e=sys.stdin.readlines()
N,M,Q=map(int,e[0].split())
dp=[[0]*-~N for _ in[0]*-~N]
for k,c in collections.Counter(e[1:M+1]).items():
    L,R=map(int,k.split())
    for i in range(1,L+1):
        for j in range(R,N+1):
            dp[i][j] += c
ans=''
for x in e[M+1:]:
    p,q=map(int,x.split())
    ans+=f'{dp[p][q]}\n'
print(ans[:-1])

Fixed submission:
import sys
def main():
    s = sys.stdin.readlines()
    N, M, Q = map(int, s[0].split())
    x = [[0] * N for _ in [0] * N]
    for e in s[1:M + 1]:
        L, R = map(int, e.split())
        x[L - 1][R - 1] += 1
    for k in range(1, N):
        for i in range(N - k):
            j = i + k
            x[i][j] += x[i][j - 1] + x[i + 1][j] - x[i + 1][j - 1]
    res = []
    for e in s[M + 1:]:
        p, q = map(int, e.split())
        res.append(x[p - 1][q - 1])
    print('\n'.join(map(str, res)))
if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
import sys
e=sys.stdin.readlines()
N,M,Q=map(int,e[0].split())
dp=[[0]*-~N for _ in[0]*-~N]
for x in e[1:M+1]:
    L,R=map(int,x.split())
    for i in range(1,L+1):
        for j in range(R,N+1):
            dp[i][j] += 1
for x in e[M+1:]:
    p,q=map(int,x.split())
    print(dp[p][q])

Fixed submission:
import sys
def main():
    s = sys.stdin.readlines()
    N, M, Q = map(int, s[0].split())
    x = [[0] * N for _ in [0] * N]
    for e in s[1:M + 1]:
        L, R = map(int, e.split())
        x[L - 1][R - 1] += 1
    for k in range(1, N):
        for i in range(N - k):
            j = i + k
            x[i][j] += x[i][j - 1] + x[i + 1][j] - x[i + 1][j - 1]
    res = []
    for e in s[M + 1:]:
        p, q = map(int, e.split())
        res.append(x[p - 1][q - 1])
    print('\n'.join(map(str, res)))
if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
N,M,Q=map(int,input().split())
dp=[[0]*-~N for _ in[0]*-~N]
for _ in[0]*M:
    L,R=map(int,input().split())
    for i in range(1,L+1):
        for j in range(R,N+1):
            dp[i][j] += 1
for _ in[0]*Q:
    p,q=map(int,input().split())
    print(dp[p][q])

Fixed submission:
import sys
def main():
    s = sys.stdin.readlines()
    N, M, Q = map(int, s[0].split())
    x = [[0] * N for _ in [0] * N]
    for e in s[1:M + 1]:
        L, R = map(int, e.split())
        x[L - 1][R - 1] += 1
    for k in range(1, N):
        for i in range(N - k):
            j = i + k
            x[i][j] += x[i][j - 1] + x[i + 1][j] - x[i + 1][j - 1]
    res = []
    for e in s[M + 1:]:
        p, q = map(int, e.split())
        res.append(x[p - 1][q - 1])
    print('\n'.join(map(str, res)))
if __name__ == '__main__':
    main()