내가 생각한 코드2

#1. Alt+W+N 입력하고 Alt+W+V :

import sys
sys.stdin = open("input.txt", "rt")

n = int(input())
a = [list(map(int,input().split()))for _ in range(n)]

res = 0

for i in range(n):
    sum1 = 0
    sum2 = 0
    for j in range(n):
        sum1 += a[i][j]
        sum2 += a[j][i]
    if sum1 > sum2:
        if sum1>res:
            res = sum1
    else: 
        if sum2>res:
            res = sum2

sum1 = 0
sum2 = 0
for i in range(n):
    sum1 += a[i][i]
    sum2 += a[n-i-1][i]
    if sum1 > sum2:
        if sum1>res:
            res = sum1
    else: 
        if sum2>res:
            res = sum2
print(res)

선생님 코드

#1. Alt+W+N 입력하고 Alt+W+V :

import sys
sys.stdin = open("input.txt", "rt")

n = int(input())
a = [list(map(int,input().split()))for _ in range(n)]
largest = -217000000

for i in range(n):
    sum1 = sum2 = 0
    for j in range(n):
        sum1 += a[i][j]
        sum2 += a[j][i]
    if sum1 > largest:
        largest = sum1 
    if sum2>largest:
        largest = sum2
# 한번만 하면 되네... 이런..... 한번을 줄여주셨다 센세가..


sum1 = 0
sum2 = 0
for i in range(n):
    sum1 += a[i][i]
    sum2 += a[i][n-i-1]
    if sum1 > largest:
        largest = sum1 
    if sum2>largest:
        largest = sum2
print(largest)

if else 문 2번 줄이셨네... 에휴 안유진 바보