Compilare: user.cpp: In function ‘int main()’: user.cpp:53:20: warning: comparisons like ‘X<=Y<=Z’ do not have their mathematical meaning [-Wparentheses] if ( k < pl <= n-k ) best[pl] = min(best[pl],(long long)max(a[pl]-a[j],a[i]-a[pl])); ^ user.cpp:56:16: warning: comparisons like ‘X<=Y<=Z’ do not have their mathematical meaning [-Wparentheses] if ( k < pl <= n-k ) best[pl] = min(best[pl],(long long)max(a[pl]-a[j],a[i]-a[pl])); ^ user.cpp:64:20: warning: comparisons like ‘X<=Y<=Z’ do not have their mathematical meaning [-Wparentheses] if ( k < pl <= n-k ) best[pl] = min(best[pl],(long long)max(a[pl]-a[j],a[i]-a[pl])); ^ user.cpp:67:16: warning: comparisons like ‘X<=Y<=Z’ do not have their mathematical meaning [-Wparentheses] if ( k < pl <= n-k ) best[pl] = min(best[pl],(long long)max(a[pl]-a[j],a[i]-a[pl])); ^