codeforces 312

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A. Whose sentence is it?

代码:

//codeforces 312 A//2013-05-01-19.12#include <stdio.h>#include <string.h>char str[102];int main(){    int n;    scanf("%d", &n);    getchar();    while (n--)    {        int f = 0;        int r = 0;        gets(str);        int l = strlen(str);        if (str[0] == 'm' && str[1] == 'i' && str[2] == 'a' && str[3] == 'o' && str[4] == '.')            r = 1;        if (str[l-5] == 'l' && str[l-4] == 'a' && str[l-3] == 'l' && str[l-2] == 'a' && str[l-1] == '.')            f = 1;        if ((!f&&!r) || (f && r))            puts("OMG>.< I don't know!");        else if (f && !r)            puts("Freda's");        else            puts("Rainbow's");    }    return 0;}

B. Archer

//codeforces 312 B//2013-05-01-19.51#include <stdio.h>const double inf = 0.00000000001;int main(){    double a, b, c, d;    double sw, zw, sl, zl; // snallr win zanoes win and lost    while (scanf("%lf %lf %lf %lf", &a, &b, &c, &d) != EOF)    {        sw = a/b;        sl = 1.0 - sw;        zw = c/d;        zl = 1.0 - zw;        double ans = 0;        double tmp = 1.0;        while(1)        {            ans += tmp*sw;            tmp = tmp*sl*zl;            if (tmp < inf)                break;        }        printf("%.12lf\n", ans);    }    return 0;}