Compilare: main.cpp: In function 'int main()': main.cpp:17:18: warning: unused variable 'j' [-Wunused-variable] int n, k, i, j, x, y, x_a, y_a, st0, st1; ^ main.cpp:17:27: warning: unused variable 'x_a' [-Wunused-variable] int n, k, i, j, x, y, x_a, y_a, st0, st1; ^~~ main.cpp:17:32: warning: unused variable 'y_a' [-Wunused-variable] int n, k, i, j, x, y, x_a, y_a, st0, st1; ^~~ main.cpp:36:15: warning: unused variable 'x_aa' [-Wunused-variable] int y_aa, x_aa; ^~~~ main.cpp:14:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "grea.in", "r", stdin ); ^ main.cpp:15:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "grea.out", "w", stdout ); ^ main.cpp:20:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ main.cpp:21:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%s", s ); ^ main.cpp:26:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%s", s ); ^