Compilare: user.cpp: In function ‘int main()’: user.cpp:120:9: warning: unused variable ‘st’ [-Wunused-variable] int st=1,dr=Ns; ^ user.cpp:120:14: warning: unused variable ‘dr’ [-Wunused-variable] int st=1,dr=Ns; ^ user.cpp:121:9: warning: unused variable ‘ret’ [-Wunused-variable] int ret=0; ^ user.cpp:101:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("potriveala.in","r",stdin); ^ user.cpp:102:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("potriveala.out","w",stdout); ^ user.cpp:104:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",r1+1); ^ user.cpp:105:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",r2+1); ^