Compilare: main.cpp: In function 'int main()': main.cpp:11:15: warning: unused variable 'm' [-Wunused-variable] int n,k=0,m,i,j,sec=0,max=-1,nr; ^ main.cpp:11:19: warning: unused variable 'j' [-Wunused-variable] int n,k=0,m,i,j,sec=0,max=-1,nr; ^ main.cpp:9:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("compact.in","r",stdin); ^ main.cpp:10:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("compact.out","w",stdout); ^