Compilare: user.cpp: In function ‘bool get_new_path()’: user.cpp:70:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < act.size(); i++) { ^ user.cpp:80:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < act.size() && !found; i++) { ^ user.cpp:83:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 1; j < path.size(); j++) { ^ user.cpp:104:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < act.size(); i++) { ^ user.cpp:113:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < act.size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:136:37: 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:137:39: 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:139:20: 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:141:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^