Compilare: user.cpp: In function ‘void play()’: user.cpp:40:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < played.size() - 1; ++i) { ~~^~~~~~~~~~~~~~~~~~~ user.cpp:48:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (played.size() > i) { ~~~~~~~~~~~~~~^~~ user.cpp: In function ‘int main()’: user.cpp:62:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("joc6.in", "r", stdin); ^ user.cpp:63:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("joc6.out", "w", stdout); ^ user.cpp:65:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:69:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.cpp:78:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^