combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:6:32: error: expected ';' before '-' token
6 | #define REP(i, n) for (int i - 0; i < (n); i++)
| ^
combo.cpp:16:2: note: in expansion of macro 'REP'
16 | REP(i, N) {
| ^~~
combo.cpp:6:39: warning: for increment expression has no effect [-Wunused-value]
6 | #define REP(i, n) for (int i - 0; i < (n); i++)
| ^
combo.cpp:16:2: note: in expansion of macro 'REP'
16 | REP(i, N) {
| ^~~
combo.cpp:6:44: error: expected ')' before ';' token
6 | #define REP(i, n) for (int i - 0; i < (n); i++)
| ~ ^
combo.cpp:16:2: note: in expansion of macro 'REP'
16 | REP(i, N) {
| ^~~
combo.cpp:16:6: error: 'i' was not declared in this scope
16 | REP(i, N) {
| ^
combo.cpp:6:46: note: in definition of macro 'REP'
6 | #define REP(i, n) for (int i - 0; i < (n); i++)
| ^
combo.cpp:12:6: warning: unused variable 'len' [-Wunused-variable]
12 | int len[M];
| ^~~