Compilare: user.cpp: In function ‘int main()’: user.cpp:28:29: warning: unused variable ‘j’ [-Wunused-variable] int n,k,m,i,nr=0,max=-1,j,cate=0,e; ^ user.cpp:28:31: warning: unused variable ‘cate’ [-Wunused-variable] int n,k,m,i,nr=0,max=-1,j,cate=0,e; ^ user.cpp:26:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("joc7.in" , "r" , stdin); ^ user.cpp:27:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("joc7.out" , "w" , stdout); ^ user.cpp:30:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d" , &n, &k, &m); ^ user.cpp:32:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d" , &v[i].st, &v[i].dr); ^