Compilare: user.cpp: In function ‘int main()’: user.cpp:42:18: warning: unused variable ‘j’ [-Wunused-variable] int N, M, i, j, x, y, z, id, maxim; ^ user.cpp:42:21: warning: unused variable ‘x’ [-Wunused-variable] int N, M, i, j, x, y, z, id, maxim; ^ user.cpp:42:24: warning: unused variable ‘y’ [-Wunused-variable] int N, M, i, j, x, y, z, id, maxim; ^ user.cpp:42:27: warning: unused variable ‘z’ [-Wunused-variable] int N, M, i, j, x, y, z, id, maxim; ^ user.cpp:42:34: warning: unused variable ‘maxim’ [-Wunused-variable] int N, M, i, j, x, y, z, id, maxim; ^ user.cpp:39:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("scmax.in","r",stdin); ^ user.cpp:40:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("scmax.out","w",stdout); ^ user.cpp:45:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^ user.cpp:47:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[ i ]); ^