Compilare: user.cpp: In function ‘int main()’: user.cpp:25:18: warning: unused variable ‘j’ [-Wunused-variable] int n, m, i, j, s, t, d, k, x, y, z, xx, yy, zz, x1, y1, z1, mi; ^ user.cpp:25:21: warning: unused variable ‘s’ [-Wunused-variable] int n, m, i, j, s, t, d, k, x, y, z, xx, yy, zz, x1, y1, z1, mi; ^ user.cpp:25:24: warning: unused variable ‘t’ [-Wunused-variable] int n, m, i, j, s, t, d, k, x, y, z, xx, yy, zz, x1, y1, z1, mi; ^ user.cpp:25:27: warning: unused variable ‘d’ [-Wunused-variable] int n, m, i, j, s, t, d, k, x, y, z, xx, yy, zz, x1, y1, z1, mi; ^ user.cpp:25:30: warning: unused variable ‘k’ [-Wunused-variable] int n, m, i, j, s, t, d, k, x, y, z, xx, yy, zz, x1, y1, z1, mi; ^ user.cpp:25:54: warning: unused variable ‘x1’ [-Wunused-variable] int n, m, i, j, s, t, d, k, x, y, z, xx, yy, zz, x1, y1, z1, mi; ^ user.cpp:25:58: warning: unused variable ‘y1’ [-Wunused-variable] int n, m, i, j, s, t, d, k, x, y, z, xx, yy, zz, x1, y1, z1, mi; ^ user.cpp:25:62: warning: unused variable ‘z1’ [-Wunused-variable] int n, m, i, j, s, t, d, k, x, y, z, xx, yy, zz, x1, y1, z1, mi; ^ user.cpp:22:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alge.in","r",stdin); ^ user.cpp:23:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alge.out","w",stdout); ^ user.cpp:28:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:30:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&z); ^ user.cpp: In function ‘void backed(int, int, int, int)’: user.cpp:102:28: warning: ‘z1’ may be used uninitialized in this function [-Wmaybe-uninitialized] backed( x1, y1, z1, n ); ^ user.cpp:102:28: warning: ‘y1’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:102:28: warning: ‘x1’ may be used uninitialized in this function [-Wmaybe-uninitialized]