Compilare: user.cpp: In function ‘void lee(int, int)’: user.cpp:20:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, s, d, k, x_aa, y_aa; ^ user.cpp:20:21: warning: unused variable ‘k’ [-Wunused-variable] int i, j, s, d, k, x_aa, y_aa; ^ user.cpp: In function ‘int back_lee(int, int)’: user.cpp:69:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] x_aa = xx - x_a[vv[xx][yy]]; ^ user.cpp:70:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] y_aa = yy - y_a[vv[xx][yy]]; ^ user.cpp: In function ‘int main()’: user.cpp:108:21: warning: unused variable ‘s’ [-Wunused-variable] int n, m, i, j, s, t, d, k; ^ user.cpp:108:27: warning: unused variable ‘d’ [-Wunused-variable] int n, m, i, j, s, t, d, k; ^ user.cpp:108:30: warning: unused variable ‘k’ [-Wunused-variable] int n, m, i, j, s, t, d, k; ^ user.cpp:105:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("drum6.in","r",stdin); ^ user.cpp:106:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("drum6.out","w",stdout); ^ user.cpp:110:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%*c",&n,&m); ^ user.cpp:112:55: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for( j = 1; j <= m; ++j ) scanf("%c",&q[i][j]); ^ user.cpp:113:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%*c"); ^