Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:16:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < lda[nod].size(); i++){ ^ user.cpp:17:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < lda[lda[nod][i]].size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:35:15: warning: unused variable ‘j’ [-Wunused-variable] int x, y, i, j; ^ user.cpp:32:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fof.in", "r", stdin); ^ user.cpp:33:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fof.out", "w", stdout); ^ user.cpp:34:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:38:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^