Compilare: user.cpp: In function ‘int main()’: user.cpp:20:62: warning: variable ‘l’ set but not used [-Wunused-but-set-variable] int p, n, x, y, minx, miny, maxx, maxy, difl, difc, pas, l, c, ok, nr, pas1, pas2; ^ user.cpp:20:65: warning: variable ‘c’ set but not used [-Wunused-but-set-variable] int p, n, x, y, minx, miny, maxx, maxy, difl, difc, pas, l, c, ok, nr, pas1, pas2; ^ user.cpp:20:68: warning: unused variable ‘ok’ [-Wunused-variable] int p, n, x, y, minx, miny, maxx, maxy, difl, difc, pas, l, c, ok, nr, pas1, pas2; ^ user.cpp:20:76: warning: variable ‘pas1’ set but not used [-Wunused-but-set-variable] int p, n, x, y, minx, miny, maxx, maxy, difl, difc, pas, l, c, ok, nr, pas1, pas2; ^ user.cpp:20:82: warning: variable ‘pas2’ set but not used [-Wunused-but-set-variable] int p, n, x, y, minx, miny, maxx, maxy, difl, difc, pas, l, c, ok, nr, pas1, pas2; ^ user.cpp:18:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "perfect2.in", "r", stdin ); ^ user.cpp:19:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "perfect2.out", "w", stdout ); ^ user.cpp:21:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d%d", &p, &n ); ^ user.cpp:25:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d%d", &x, &y ); ^