Compilare: user.cpp: In function ‘int main()’: user.cpp:18:21: warning: unused variable ‘x’ [-Wunused-variable] int n, m, i, k, x, y; ^ user.cpp:18:24: warning: unused variable ‘y’ [-Wunused-variable] int n, m, i, k, x, y; ^ user.cpp:15:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "stergeri.in", "r", stdin ); ^ user.cpp:16:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "stergeri.out", "w", stdout ); ^ user.cpp:20:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d%d", &n, &m, &k ); ^ user.cpp:23:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d", &v[i].a, &v[i].b ); ^