Compilare: user.cpp: In function ‘int find(int)’: user.cpp:8:9: warning: unused variable ‘r’ [-Wunused-variable] int r=x, y; ^ user.cpp:8:14: warning: unused variable ‘y’ [-Wunused-variable] int r=x, y; ^ user.cpp: In function ‘int main()’: user.cpp:25:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("curcubeu.in", "r", stdin); ^ user.cpp:26:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("curcubeu.out", "w", stdout); ^ user.cpp:27:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &n, &a[1], &b[1], &c[1]); ^