Compilare: user.cpp: In function ‘int main()’: user.cpp:33:18: warning: unused variable ‘j’ [-Wunused-variable] int n, m, i, j, x, y, s, k, nod, fiu; ^ user.cpp:33:27: warning: unused variable ‘s’ [-Wunused-variable] int n, m, i, j, x, y, s, k, nod, fiu; ^ user.cpp:33:30: warning: unused variable ‘k’ [-Wunused-variable] int n, m, i, j, x, y, s, k, nod, fiu; ^ user.cpp:30:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "ciclueuler.in", "r", stdin ); ^ user.cpp:31:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "ciclueuler.out", "w", stdout ); ^ user.cpp:35:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d",&n,&m ); ^ user.cpp:37:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d",&x,&y ); ^