Compilare: user.cpp: In function ‘void Solve()’: user.cpp:34:45: warning: unused variable ‘s1’ [-Wunused-variable] int i,j,dr[Nmax],stt[Nmax],top,st[Nmax],s1,s2,s3,s4; ^ user.cpp:34:48: warning: unused variable ‘s2’ [-Wunused-variable] int i,j,dr[Nmax],stt[Nmax],top,st[Nmax],s1,s2,s3,s4; ^ user.cpp:34:51: warning: unused variable ‘s3’ [-Wunused-variable] int i,j,dr[Nmax],stt[Nmax],top,st[Nmax],s1,s2,s3,s4; ^ user.cpp:34:54: warning: unused variable ‘s4’ [-Wunused-variable] int i,j,dr[Nmax],stt[Nmax],top,st[Nmax],s1,s2,s3,s4; ^ user.cpp: In function ‘int main()’: user.cpp:71:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("jmenoasa.in","r",stdin); ^ user.cpp:72:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("jmenoasa.out","w",stdout); ^ user.cpp:73:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N,&M); ^ user.cpp:76:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i][j]); ^