Taking a non-standard input format

Scanf

Taking a non-standard input format

#include <cstdio> 

using namespace std;

int N; // using global variables in contests can be a good strategy 
char x[110];  // make it a habit to set array size a bit larger than needed

int main() { 

scanf("%d\n", &N); 

while (N--) {

 // we simply loop from N, N-1, N-2, ..., 0 

scanf("0.%[0-9]...\n", &x); // ‘&’ is optional when x is a char array 

// note: if you are surprised with the trick above,

// please check scanf details in www.cppreference.com printf("the digits are 0.%s\n", x); 

} 

} 

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Source - Competitive Programming by Steven Halim