Compilare: user.cpp: In function ‘void Lee(int, int, int)’: user.cpp:36:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, dir, xx, yy; ^ user.cpp: In function ‘int main()’: user.cpp:143:8: warning: statement has no effect [-Wunused-value] ans; ^ user.cpp:117:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("robot2.in","r",stdin); ^ user.cpp:118:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("robot2.out","w",stdout); ^ user.cpp:120:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:123:54: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &mat[i][j]), obs += mat[i][j]; ^ user.cpp:124:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &S.first, &S.second); ^ user.cpp:125:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &D.first, &D.second); ^