0_0_39194771_10619.cpp: In function 'int main()': 0_0_39194771_10619.cpp:13:12: error: 'n' was not declared in this scope 13 | if(n % 4 == 0 && (n % 100 != 0 || n % 400 == 0))sum++;//ÈòÔ¼ÓÒ»Ìì | ^