Compilare: user.cpp: In function ‘int main()’: user.cpp:11:29: warning: unused variable ‘x’ [-Wunused-variable] int n, k, i, j, x, y, s1, s2; ^ user.cpp:11:32: warning: unused variable ‘y’ [-Wunused-variable] int n, k, i, j, x, y, s1, s2; ^ user.cpp:12:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("joc13.in","r",stdin); ^ user.cpp:13:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("joc13.out","w",stdout); ^ user.cpp:14:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:16:58: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (j=1; j<=n; j++) scanf("%d",&a[i][j]); ^