Compilare: user.cpp: In function ‘void CalcTarjan(int)’: user.cpp:27:16: warning: unused variable ‘value’ [-Wunused-variable] static int value ,nodecmp ; ^ user.cpp:27:23: warning: unused variable ‘nodecmp’ [-Wunused-variable] static int value ,nodecmp ; ^ user.cpp: In function ‘int main()’: user.cpp:88:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("2sat.in","r",stdin); ^ user.cpp:89:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("2sat.out","w",stdout); ^ user.cpp:92:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&noVar , &noOper ); ^ user.cpp:98:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x , &y ); ^