Compilare: user.cpp: In function ‘int main()’: user.cpp:29:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,k,t; ^ user.cpp:29:13: warning: unused variable ‘k’ [-Wunused-variable] int i,j,k,t; ^ user.cpp:29:15: warning: unused variable ‘t’ [-Wunused-variable] int i,j,k,t; ^ user.cpp:30:10: warning: unused variable ‘c’ [-Wunused-variable] char c; ^ user.cpp:31:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cuplaj.txt","r",stdin); ^ user.cpp:32:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cuplaj.out","w",stdout); ^ user.cpp:33:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&N,&M,&K); ^ user.cpp:56:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^