Compilare: user.cpp: In function ‘int main()’: user.cpp:42:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < conex.size(); i++) ^ user.cpp:45:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < conex.size(); i++){ ^ user.cpp:47:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < conex[i].size(); j++) ^ user.cpp: In function ‘void ctc(int)’: user.cpp:59:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < l[v].size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:29:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("retele.in", "r", stdin); ^ user.cpp:30:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("retele.out", "w", stdout); ^ user.cpp:31:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n", &n, &m); ^ user.cpp:33:22: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(v, 20, stdin); ^