Compilare: main.cpp: In function 'int main()': main.cpp:3:46: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] int main(){freopen("trompeta.out","w",stdout);int n,m,k=0;char c=0;fin>>n>>m;for(int i=1;i<=n;i++){fin >> c;while(k&&ans[k]<c&&k+n-i>=m)--k;ans[++k]=c;}puts(ans+1);return 0; ^