Compilare: user.cpp: In function ‘bool vec(int, int, int, int)’: user.cpp:24:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp: In function ‘void lee(int, int)’: user.cpp:36:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, s, d, k, x_aa, y_aa; ^ user.cpp:36:15: warning: unused variable ‘s’ [-Wunused-variable] int i, j, s, d, k, x_aa, y_aa; ^ user.cpp:36:18: warning: unused variable ‘d’ [-Wunused-variable] int i, j, s, d, k, x_aa, y_aa; ^ user.cpp:36:21: warning: unused variable ‘k’ [-Wunused-variable] int i, j, s, d, k, x_aa, y_aa; ^ user.cpp: In function ‘int main()’: user.cpp:65:21: warning: unused variable ‘s’ [-Wunused-variable] int n, m, i, j, s, t, d, k, p; ^ user.cpp:65:24: warning: unused variable ‘t’ [-Wunused-variable] int n, m, i, j, s, t, d, k, p; ^ user.cpp:65:27: warning: unused variable ‘d’ [-Wunused-variable] int n, m, i, j, s, t, d, k, p; ^ user.cpp:65:30: warning: unused variable ‘k’ [-Wunused-variable] int n, m, i, j, s, t, d, k, p; ^ user.cpp:62:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pescari.in","r",stdin); ^ user.cpp:63:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pescari.out","w",stdout); ^ user.cpp:68:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&p); ^ user.cpp:72:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i][j]); ^