Compilare: user.cpp: In function ‘int main()’: user.cpp:49:129: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(!number.empty() && previous != -1 && number[previous] < domino(y, x) && cuts && number.size() - previous <= cuts) ^ user.cpp:80:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < number.size() - cuts; i++) ^ user.cpp:34:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("domino1.in", "r", stdin); ^ user.cpp:35:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("domino1.out", "w", stdout); ^ user.cpp:37:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &N, &rotations, &cuts); ^ user.cpp:41:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); r = false; ^