Compilare: user.cpp: In function ‘void add_cycle(int)’: user.cpp:20:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int gap = 0; gap < cycle.size(); ++gap) { ^ user.cpp: In function ‘void add_cycle(int, int)’: user.cpp:32:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int gap = -1; gap < cycle.size(); ++gap) { ^ user.cpp: In function ‘void solve(int)’: user.cpp:139:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < in.size(); ++i) { ^ user.cpp:145:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < out.size(); ++i) { ^ user.cpp:151:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < in.size(); ++i) { ^ user.cpp:160:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < out.size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:175:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plimbare.in", "r", stdin); ^ user.cpp:176:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plimbare.out", "w", stdout); ^ user.cpp:178:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:182:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^