Compilare: user.cpp: In function ‘int main()’: user.cpp:46:17: warning: unused variable ‘sol’ [-Wunused-variable] int i,x,y,z,sol,st,dr,mij,M; ^ user.cpp:46:21: warning: unused variable ‘st’ [-Wunused-variable] int i,x,y,z,sol,st,dr,mij,M; ^ user.cpp:46:24: warning: unused variable ‘dr’ [-Wunused-variable] int i,x,y,z,sol,st,dr,mij,M; ^ user.cpp:46:27: warning: unused variable ‘mij’ [-Wunused-variable] int i,x,y,z,sol,st,dr,mij,M; ^ user.cpp:47:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("arbint.in","r",stdin); ^ user.cpp:48:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("arbint.out","w",stdout); ^ user.cpp:49:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N,&M); ^ user.cpp:52:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.cpp:58:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x,&y,&z); ^