Compilare: user.cpp: In function ‘int main()’: user.cpp:20:15: warning: unused variable ‘j’ [-Wunused-variable] int n, i, j, s, t, d, k, c, ma; ^ user.cpp:20:21: warning: unused variable ‘t’ [-Wunused-variable] int n, i, j, s, t, d, k, c, ma; ^ user.cpp:20:24: warning: unused variable ‘d’ [-Wunused-variable] int n, i, j, s, t, d, k, c, ma; ^ user.cpp:20:27: warning: unused variable ‘k’ [-Wunused-variable] int n, i, j, s, t, d, k, c, ma; ^ user.cpp:17:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("charlie.in","r",stdin); ^ user.cpp:18:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("charlie.out","w",stdout); ^ user.cpp:22:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&c); ^ user.cpp:23:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",q); ^