Compilare: user.cpp: In function ‘int main()’: user.cpp:27:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alpin.in","r",stdin); ^ user.cpp:28:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alpin.out","w",stdout); ^ user.cpp:29:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:31:44: 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]);dp[i][j]=++c;} ^ user.cpp:35:24: warning: array subscript is above array bounds [-Warray-bounds] q[dp[i][j]][2]=j; ^ user.cpp:46:45: warning: array subscript is above array bounds [-Warray-bounds] cout<<q[sol[i]][1]<<' '<<q[sol[i]][2]<<'\n'; ^