Buggy python submission (verdict: Runtime Error):
import numpy as np
from sys import stdin

def main():
    nm = [int(x) for x in stdin.readline().rstrip().split()]
    gate = np.zeros([nm[1], 2])
    card = np.full([nm[0]], True)
    
    for i in range(nm[1]):
        g = [int(x) for x in stdin.readline().rstrip().split()]
        gate[i] = g
    for g in gate:
        for k in range(len(card)):
            if k < g[0]-1 or k >= g[1]:
                card[k] = False
    
    c = np.zeros_like(card)[card]
    print(len(c))

if __name__ == "__main__":
    main()

Fixed submission:
import numpy as np
from sys import stdin

def main():
    nm = [int(x) for x in stdin.readline().rstrip().split()]
    gate = np.zeros([nm[1], 2], dtype=int)
    
    for i in range(nm[1]):
        g = [int(x) for x in stdin.readline().rstrip().split()]
        gate[i] = g
    
    l_max = np.max(gate[:, 0])
    r_min = np.min(gate[:, 1])
    c = 0
    if l_max <= r_min:
        c = r_min-l_max+1
    print(c)

if __name__ == "__main__":
    main()

Buggy python submission (verdict: Runtime Error):
import numpy as np
from sys import stdin

def main():
    nm = [int(x) for x in stdin.readline().rstrip().split()]
    card = np.full([nm[0]], True)
    
    for i in range(nm[1]):
        g = [int(x) for x in stdin.readline().rstrip().split()]
        for k in range(len(card)):
            if k < g[0]-1 or k >= g[1]:
                card[k] = False
    
    c = np.zeros_like(card)[card]
    print(len(c))

if __name__ == "__main__":
    main()

Fixed submission:
import numpy as np
from sys import stdin

def main():
    nm = [int(x) for x in stdin.readline().rstrip().split()]
    gate = np.zeros([nm[1], 2], dtype=int)
    
    for i in range(nm[1]):
        g = [int(x) for x in stdin.readline().rstrip().split()]
        gate[i] = g
    
    l_max = np.max(gate[:, 0])
    r_min = np.min(gate[:, 1])
    c = 0
    if l_max <= r_min:
        c = r_min-l_max+1
    print(c)

if __name__ == "__main__":
    main()

Buggy python submission (verdict: Runtime Error):
import numpy as np
from sys import stdin

def main():
    nm = [int(x) for x in stdin.readline().rstrip().split()]
    gate = np.full([nm[1], nm[0]], False)
    
    for i in range(nm[1]):
        g = [int(x) for x in stdin.readline().rstrip().split()]
        for k in range(g[0]-1, g[1]):
            gate[i,k] = True

    count = 0
    for i in range(len(gate[0])):
        tmp = gate[:, i]
        if tmp.all():
            count += 1
        
    print(count)

if __name__ == "__main__":
    main()

Fixed submission:
import numpy as np
from sys import stdin

def main():
    nm = [int(x) for x in stdin.readline().rstrip().split()]
    gate = np.zeros([nm[1], 2], dtype=int)
    
    for i in range(nm[1]):
        g = [int(x) for x in stdin.readline().rstrip().split()]
        gate[i] = g
    
    l_max = np.max(gate[:, 0])
    r_min = np.min(gate[:, 1])
    c = 0
    if l_max <= r_min:
        c = r_min-l_max+1
    print(c)

if __name__ == "__main__":
    main()

Buggy python submission (verdict: Runtime Error):
import numpy as np
from sys import stdin

def main():
    nm = [int(x) for x in stdin.readline().rstrip().split()]
    gate = np.full([nm[1], nm[0]], False)
    
    for i in range(nm[1]):
        g = [int(x) for x in stdin.readline().rstrip().split()]
        for k in range(g[0]-1, g[1]):
            gate[i,k] = True

    count = 0
    for i in range(len(gate[0])):
        tmp = gate[:, i]
        if tmp.all():
            count += 1
        
    print(count)

if __name__ == "__main__":
    main()

Fixed submission:
import numpy as np
from sys import stdin

def main():
    nm = [int(x) for x in stdin.readline().rstrip().split()]
    gate = np.zeros([nm[1], 2], dtype=int)
    
    for i in range(nm[1]):
        g = [int(x) for x in stdin.readline().rstrip().split()]
        gate[i] = g
    
    l_max = np.max(gate[:, 0])
    r_min = np.min(gate[:, 1])
    c = 0
    if l_max <= r_min:
        c = r_min-l_max+1
    print(c)

if __name__ == "__main__":
    main()