Compilare: user.cpp: In function ‘void solve()’: user.cpp:74:9: warning: unused variable ‘m’ [-Wunused-variable] int m, M, i, j; ^ user.cpp:74:12: warning: unused variable ‘M’ [-Wunused-variable] int m, M, i, j; ^ user.cpp: In function ‘void read()’: user.cpp:21:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d%d%d", &n, &X [1], &X [2], &X [3]); ^ user.cpp:23:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &x, &y); ^ user.cpp: In function ‘int main()’: user.cpp:114:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("arbxyz.in", "r", stdin); ^ user.cpp:115:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("arbxyz.out", "w", stdout); ^ user.cpp:117:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &T); ^