Compilare: user.cpp: In function ‘int main()’: user.cpp:68:9: warning: unused variable ‘k’ [-Wunused-variable] int k = sqrt(n) , l = pow(n,1/3.0); ^ user.cpp:68:23: warning: unused variable ‘l’ [-Wunused-variable] int k = sqrt(n) , l = pow(n,1/3.0); ^ user.cpp:69:9: warning: unused variable ‘st’ [-Wunused-variable] int st,dr; ^ user.cpp:69:12: warning: unused variable ‘dr’ [-Wunused-variable] int st,dr; ^ user.cpp:64:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pscpld2d.in","r",stdin); ^ user.cpp:65:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:66:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (int i=1;i<=n;++i) scanf("%s",c[i] + 1); ^ user.cpp:77:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pscpld2d.out","w",stdout); ^