#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <stdio.h>
#include <cmath>

using namespace std;

int p=0,n=0,V=0,T=0;
char c;
int a=0,b=0,c1=0,d=0;
double R=8.314;

int main()
{
    for(int i = 0; i < 3; i++)
    {
        cin >> c;
        if(c=='p')
        {
            cin >> c;
            cin >> p;
            a++;
        }
        if(c=='n')
        {
            cin >> c;
            cin >> n;
            b++;
        }
        if(c=='V')
        {
            cin >> c;
            cin >> V;
            c1++;
        }
        if(c=='T')
        {
            cin >> c;
            cin >> T;
            d++;
        }

    }
    if(a==0) cout << "p = " << R*n*T/V;
    if(b==0) cout << "n = " << p*V/(R*T);
    if(c1==0)
    {
        if(p==0 && n==0)
        {
            cout << "undefined";
            return 0;
        }
        if(p==0 || n==0)
        {
            cout << "error";
            return 0;
        }
        cout << "V = " << R*n*T/p;
    }
    if(d==0)
    {
        if(p==0 && n==0)
        {
            cout << "undefined";
            return 0;
        }
        if(p==0 || n==0)
        {
            cout << "error";
            return 0;
        }
        cout << "T = " << p*V/(R*n);
    }
    return 0;
}

Так же было и на самом контесте WA 11, сейчас тоже WA 11, хотя на разборе говорили все тоже самое

Edited by author 20.03.2011 13:07

Edited by author 20.03.2011 13:07

Use printf;

Write something like this

printf("n = %0.7Lf",rez);

and be sure that you don't have any cout<<.
I don't know the reason, this was my "mistake" and produced many WA :(


Edited by author 14.07.2011 17:56

You can also write with setprecision. I think you have to output at least 3 decimals but I'm not sure.

You must use fixed setprecision at least with 5 decimals:
cout << fixed << setprecision(5);