Compilare: main.cpp: In function 'void bfs(int, int)': main.cpp:18:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < q.size()){ ~~^~~~~~~~~~ main.cpp: In function 'bool check(int)': main.cpp:46:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < q.size()){ ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:78:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("harta3.in", "r", stdin); ^ main.cpp:79:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("harta3.out", "w", stdout); ^ main.cpp:81:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:82:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a, &b); ^ main.cpp:87:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &d); ^