View Compilation Error

0_0_15398278_18256.cpp:30:5: error: redefinition of 'int n'
 int n,m,i,j;
     ^
0_0_15398278_18256.cpp:2:5: note: 'int n' previously declared here
 int n,m,i,j;
     ^
0_0_15398278_18256.cpp:30:7: error: redefinition of 'int m'
 int n,m,i,j;
       ^
0_0_15398278_18256.cpp:2:7: note: 'int m' previously declared here
 int n,m,i,j;
       ^
0_0_15398278_18256.cpp:30:9: error: redefinition of 'int i'
 int n,m,i,j;
         ^
0_0_15398278_18256.cpp:2:9: note: 'int i' previously declared here
 int n,m,i,j;
         ^
0_0_15398278_18256.cpp:30:11: error: redefinition of 'int j'
 int n,m,i,j;
           ^
0_0_15398278_18256.cpp:2:11: note: 'int j' previously declared here
 int n,m,i,j;
           ^
0_0_15398278_18256.cpp: In function 'int main()':
0_0_15398278_18256.cpp:31:5: error: redefinition of 'int main()'
 int main()
     ^
0_0_15398278_18256.cpp:3:5: note: 'int main()' previously defined here
 int main()
     ^