Compilare: main.cpp: In function 'int main()': main.cpp:6:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rosiimici.in","r",stdin);freopen("rosiimici.out","w",stdout); ^ main.cpp:6:70: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rosiimici.in","r",stdin);freopen("rosiimici.out","w",stdout); ^ main.cpp:7:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] int n,m,q,x;scanf("%d %d %d",&n,&m,&q); ^ main.cpp:9:45: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] {for(int j=1;j<=m;++j)scanf("%d",&mat[i][j]);sort(mat[i]+1,mat[i]+m+1);for(int j=1;j<=m;++j)dp[mat[i][j]]=max(dp[mat[i][j]],i*j);} ^ main.cpp:11:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] while(q--){scanf("%d",&x);printf("%d\n",dp[x]);} ^