#include<stdio.h> #include<ctype.h> #include<string.h> #include<iostream> #include<stack> #include<time.h> #include<math.h> using namespace std; /*test*/ //#define as '\x41' //int atoi(char s[]); //int strlen(char s[]); //void squeeze(char s[], char c); //void strcat(char s[], char t[]); //int bitcount(unsigned x); int main() { int a, b, c; float s; scanf("%d%d%d", &a, &b, &c); s =float(sqrt((a + b + c)*(a + b - c)*(a + c - b)*(b + c - a))) / 4; printf("%.2f", s); } |
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