Compilare: user.cpp: In function ‘bool solve(int, int)’: user.cpp:54:13: warning: unused variable ‘c1’ [-Wunused-variable] int c1 = (a > b) || (c > d); ^ user.cpp:55:13: warning: unused variable ‘c2’ [-Wunused-variable] int c2 = (a < b) || (c < d); ^ user.cpp: In function ‘int main()’: user.cpp:76:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sortnet.in", "r", stdin); ^ user.cpp:77:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sortnet.out", "w", stdout); ^ user.cpp:79:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n", &n, &m); ^ user.cpp:84:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("<%d,%d> ", &x, &y); ^