Compilare: user.cpp: In function ‘int Tarjan(int)’: user.cpp:110:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (k < list[push[u]].size() && list[push[u]][k] != inside[v]) { ^ user.cpp:113:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k == list[push[u]].size()) { ^ user.cpp:137:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = 0; k < list[push[v]].size(); k++) { ^ user.cpp: In function ‘int main()’: user.cpp:151:13: warning: unused variable ‘k’ [-Wunused-variable] int i, j, k; ^ user.cpp: In function ‘char getChar(FILE*)’: user.cpp:71:32: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, MAX_BUFF, f); ^ user.cpp: In function ‘int main()’: user.cpp:201:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("control.out", "w", stdout); ^