Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:47:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < vecin[x].size(); ++i) ^ user.cpp:51:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < vecin[nod].size(); ++i){ ^ user.cpp:55:57: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < vecin[new_node].size(); ++j) ^ user.cpp:61:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < vecin[nod].size(); ++i){ ^ user.cpp:65:58: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < vecin[new_node].size(); ++j) ^ user.cpp:73:57: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < vecin[new_node].size(); ++j) ^ user.cpp: In function ‘void write()’: user.cpp:88:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < sol.size(); ++i) ^ user.cpp: In function ‘void read()’: user.cpp:26:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &m, &start); ^ user.cpp:30:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.cpp:35:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^ user.cpp: In function ‘int main()’: user.cpp:94:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("markon.in", "r", stdin); ^ user.cpp:95:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("markon.out", "w", stdout); ^