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Main.cc: In function ‘void solve()’:
Main.cc:43:12: error: expected unqualified-id before numeric constant
     FOR(ll,0,i,31) if(n >> i & 1) res = res * 3 % MOD;
            ^
Main.cc:31:30: note: in definition of macro ‘FOR’
 #define FOR(dl,a,b,c) for(dl a=b;a<=c;a++)
                              ^
Main.cc:43:12: error: expected ‘;’ before numeric constant
     FOR(ll,0,i,31) if(n >> i & 1) res = res * 3 % MOD;
            ^
Main.cc:31:30: note: in definition of macro ‘FOR’
 #define FOR(dl,a,b,c) for(dl a=b;a<=c;a++)
                              ^
Main.cc:43:14: error: ‘i’ was not declared in this scope
     FOR(ll,0,i,31) if(n >> i & 1) res = res * 3 % MOD;
              ^
Main.cc:31:32: note: in definition of macro ‘FOR’
 #define FOR(dl,a,b,c) for(dl a=b;a<=c;a++)
                                ^
Main.cc:31:35: warning: for increment expression has no effect [-Wunused-value]
 #define FOR(dl,a,b,c) for(dl a=b;a<=c;a++)
Main.cc:43:12:
     FOR(ll,0,i,31) if(n >> i & 1) res = res * 3 % MOD;
            ~~~~~                   
Main.cc:43:5: note: in expansion of macro ‘FOR’
     FOR(ll,0,i,31) if(n >> i & 1) res = res * 3 % MOD;
     ^~~
Main.cc:31:38: error: expected ‘)’ before ‘;’ token
 #define FOR(dl,a,b,c) for(dl a=b;a<=c;a++)
                                      ^
Main.cc:43:5: note: in expansion of macro ‘FOR’
     FOR(ll,0,i,31) if(n >> i & 1) res = res * 3 % MOD;
     ^~~
Main.cc:31:40: error: lvalue required as increment operand
 #define FOR(dl,a,b,c) for(dl a=b;a<=c;a++)
                                        ^
Main.cc:43:5: note: in expansion of macro ‘FOR’
     FOR(ll,0,i,31) if(n >> i & 1) res = res * 3 % MOD;
     ^~~