Compilare: user.cpp: In function ‘int main()’: user.cpp:2:147: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] using namespace std; ifstream f("trompeta.in"); ofstream g("trompeta.out"); int n, m, i, u=1; char c[1000005], a[1000005]; int main() { f>>n>>m>>c+1; a[1]=c[1]; for(i=2;i<=n;i++) { while(c[i]>a[u] && u>0 && u+n-i+1>m) u--; a[++u]=c[i]; } g<<a+1; } ^