Compilare: user.cpp: In function ‘void sol()’: user.cpp:11:9: warning: unused variable ‘nr’ [-Wunused-variable] int nr, x, sol1 = 0, sol2 = 0; ^ user.cpp:11:13: warning: unused variable ‘x’ [-Wunused-variable] int nr, x, sol1 = 0, sol2 = 0; ^ user.cpp:11:16: warning: unused variable ‘sol1’ [-Wunused-variable] int nr, x, sol1 = 0, sol2 = 0; ^ user.cpp: In function ‘int main()’: user.cpp:49:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("livada.in","r",stdin); ^ user.cpp:50:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("livada.out","w",stdout); ^ user.cpp:52:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d\n", &M, &N, &k); ^ user.cpp:56:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ", &a[i][j]); ^