Compilare: user.cpp: In function ‘bool bf_flux(int, int)’: user.cpp:41:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < A[x].size(); i++) { ^ user.cpp:58:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < A[dst].size(); i++) { ^ user.cpp: In function ‘void bf(int, int*)’: user.cpp:97:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < A[x].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:140:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < Ans.size(); i++) ^ user.cpp:109:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("critice.in", "r", stdin); ^ user.cpp:110:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("critice.out", "w", stdout); ^ user.cpp:112:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:114:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &x, &y, &z); ^