Compilare: user.cpp: In function ‘int main()’: user.cpp:20:18: warning: unused variable ‘t’ [-Wunused-variable] int i, j, s, t, d, k, x_aa, y_aa, x_aa_2, y_aa_2; ^ user.cpp:20:21: warning: unused variable ‘d’ [-Wunused-variable] int i, j, s, t, d, k, x_aa, y_aa, x_aa_2, y_aa_2; ^ user.cpp:20:24: warning: unused variable ‘k’ [-Wunused-variable] int i, j, s, t, d, k, x_aa, y_aa, x_aa_2, y_aa_2; ^ user.cpp:17:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cruce.in","r",stdin); ^ user.cpp:18:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cruce.out","w",stdout); ^ user.cpp:22:27: 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:24:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",v[i]); ^