Compilare: main.cpp: In function 'int main()': main.cpp:2:76: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] int mat[1005][1005],dp[100005];int main(){freopen("rosiimici.in","r",stdin);freopen("rosiimici.out","w",stdout);int n,m,q,x;scanf("%d %d %d",&n,&m,&q);for(int i=1;i<=n;++i){for(int j=1;j<=m;++j)scanf("%d",&mat[i][j]);std::sort(mat[i]+1,mat[i]+m+1);for(int j=1;j<=m;++j)dp[mat[i][j]]=std::max(dp[mat[i][j]],i*j);}for(int i=1;i<=n*m;++i)dp[i]=std::max(dp[i],dp[i-1]);while(q--){scanf("%d",&x);printf("%d\n",dp[x]);}return 0;} ^ main.cpp:2:112: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] int mat[1005][1005],dp[100005];int main(){freopen("rosiimici.in","r",stdin);freopen("rosiimici.out","w",stdout);int n,m,q,x;scanf("%d %d %d",&n,&m,&q);for(int i=1;i<=n;++i){for(int j=1;j<=m;++j)scanf("%d",&mat[i][j]);std::sort(mat[i]+1,mat[i]+m+1);for(int j=1;j<=m;++j)dp[mat[i][j]]=std::max(dp[mat[i][j]],i*j);}for(int i=1;i<=n*m;++i)dp[i]=std::max(dp[i],dp[i-1]);while(q--){scanf("%d",&x);printf("%d\n",dp[x]);}return 0;} ^ main.cpp:2:151: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] int mat[1005][1005],dp[100005];int main(){freopen("rosiimici.in","r",stdin);freopen("rosiimici.out","w",stdout);int n,m,q,x;scanf("%d %d %d",&n,&m,&q);for(int i=1;i<=n;++i){for(int j=1;j<=m;++j)scanf("%d",&mat[i][j]);std::sort(mat[i]+1,mat[i]+m+1);for(int j=1;j<=m;++j)dp[mat[i][j]]=std::max(dp[mat[i][j]],i*j);}for(int i=1;i<=n*m;++i)dp[i]=std::max(dp[i],dp[i-1]);while(q--){scanf("%d",&x);printf("%d\n",dp[x]);}return 0;} ^ main.cpp:2:217: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] int mat[1005][1005],dp[100005];int main(){freopen("rosiimici.in","r",stdin);freopen("rosiimici.out","w",stdout);int n,m,q,x;scanf("%d %d %d",&n,&m,&q);for(int i=1;i<=n;++i){for(int j=1;j<=m;++j)scanf("%d",&mat[i][j]);std::sort(mat[i]+1,mat[i]+m+1);for(int j=1;j<=m;++j)dp[mat[i][j]]=std::max(dp[mat[i][j]],i*j);}for(int i=1;i<=n*m;++i)dp[i]=std::max(dp[i],dp[i-1]);while(q--){scanf("%d",&x);printf("%d\n",dp[x]);}return 0;} ^ main.cpp:2:391: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] int mat[1005][1005],dp[100005];int main(){freopen("rosiimici.in","r",stdin);freopen("rosiimici.out","w",stdout);int n,m,q,x;scanf("%d %d %d",&n,&m,&q);for(int i=1;i<=n;++i){for(int j=1;j<=m;++j)scanf("%d",&mat[i][j]);std::sort(mat[i]+1,mat[i]+m+1);for(int j=1;j<=m;++j)dp[mat[i][j]]=std::max(dp[mat[i][j]],i*j);}for(int i=1;i<=n*m;++i)dp[i]=std::max(dp[i],dp[i-1]);while(q--){scanf("%d",&x);printf("%d\n",dp[x]);}return 0;} ^