Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:28:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[node].size(); ++ i) ^ user.cpp: In function ‘int main()’: user.cpp:65:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < replevel[i].size(); ++ j) ^ user.cpp:68:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < g[node].size(); ++ k) ^ user.cpp:47:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hektor.in", "r", stdin); ^ user.cpp:48:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hektor.out", "w", stdout); ^ user.cpp:50:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i %i %i %i", &n, &m, &A, &B); ^ user.cpp:51:59: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (int i = 1; i <= n; ++ i) scanf("%i", &cstnode[i]); ^ user.cpp:54:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i %i", &a[i], &b[i]); ^