Compilare: main.cpp: In function 'int main()': main.cpp:11:9: warning: unused variable 'n' [-Wunused-variable] int n,i,j,k,m,l=1,lmax,r,c; ^ main.cpp:11:13: warning: unused variable 'j' [-Wunused-variable] int n,i,j,k,m,l=1,lmax,r,c; ^ main.cpp:11:17: warning: unused variable 'm' [-Wunused-variable] int n,i,j,k,m,l=1,lmax,r,c; ^ main.cpp:11:23: warning: unused variable 'lmax' [-Wunused-variable] int n,i,j,k,m,l=1,lmax,r,c; ^~~~ main.cpp:9:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pscpld.in","r",stdin); ^ main.cpp:10:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pscpld.out","w",stdout); ^ main.cpp:16:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&ch); ^