Compilare: user.cpp: In function ‘bool get_new_path()’: user.cpp:75:93: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; (adj[path[i - 1]][e] == 0 || adj[e][path[i]] == 0) && i + 1 < path.size(); i++); ^ user.cpp: In function ‘int main()’: user.cpp:89:37: 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:90:39: 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:92:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); m = (n * (n - 1)) / 2; ^ user.cpp:94:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^