View Compilation Error

0_0_17724901_23639.cpp: In function 'int main()':
0_0_17724901_23639.cpp:26:30: error: too many arguments to function 'long long int solve()'
   printf("%lld\n", solve(n, m));
                              ^
0_0_17724901_23639.cpp:15:4: note: declared here
 LL solve();
    ^