0_0_13520819_11015.cpp:1:2: error: stray '#' in program
#include<iostream>
^
0_0_13520819_11015.cpp:1:10: error: stray '#' in program
#include<iostream>
^
0_0_13520819_11015.cpp:1:17: error: stray '#' in program
#include<iostream>
^
0_0_13520819_11015.cpp:1:3: error: expected unqualified-id before numeric constant
#include<iostream>
^
0_0_13520819_11015.cpp:1:3: error: expected constructor, destructor, or type conversion before numeric constant
0_0_13520819_11015.cpp:1:11: error: expected unqualified-id before numeric constant
#include<iostream>
^
0_0_13520819_11015.cpp:1:11: error: expected constructor, destructor, or type conversion before numeric constant
0_0_13520819_11015.cpp:1:18: error: 'include' does not name a type
#include<iostream>
^
0_0_13520819_11015.cpp: In function 'int main()':
0_0_13520819_11015.cpp:8:8: error: 'cin' was not declared in this scope
while(cin>>n)
^
0_0_13520819_11015.cpp:13:3: error: 'cout' was not declared in this scope
cout<<a*(a-1)/2+b*(b-1)/2<<endl;
^
0_0_13520819_11015.cpp:13:30: error: 'endl' was not declared in this scope
cout<<a*(a-1)/2+b*(b-1)/2<<endl;
^
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