View Compilation Error

0_0_38153786_14756.cpp: In function 'int main()':
0_0_38153786_14756.cpp:5:13: error: redeclaration of 'int n'
         int n, m; cin >> n >> m;
             ^
0_0_38153786_14756.cpp:4:13: note: 'int n' previously declared here
     for(int n, m; ~scanf("%d%d", &n, &m);){
             ^
0_0_38153786_14756.cpp:5:16: error: redeclaration of 'int m'
         int n, m; cin >> n >> m;
                ^
0_0_38153786_14756.cpp:4:16: note: 'int m' previously declared here
     for(int n, m; ~scanf("%d%d", &n, &m);){
                ^