Compilare: user.cpp: In function ‘void get_perm()’: user.cpp:28:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, x; ^ user.cpp: In function ‘void solve()’: user.cpp:72:12: warning: suggest parentheses around assignment used as truth value [-Wparentheses] vis[i] = v[1][i] = v[0][i] = pos[1][i] = pos[0][i] = 0; ^ user.cpp: In function ‘void rsw()’: user.cpp:12:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("echival1.in" ,"r", stdin); ^ user.cpp:13:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("echival1.out", "w", stdout); ^ user.cpp:14:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); t = 10; ^ user.cpp: In function ‘void get_perm()’: user.cpp:31:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[0][i]); ^ user.cpp:41:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[1][i]); ^