Submission #19828

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Source Code Expand

#include <stdio.h>
#include <math.h>

long check(long, long, long, long, long, long, long);
int eProduct(long, long, long, long, long, long);

int main() 
{
	long N, s, g, l, r, i, si;
	long newS;
	double sum = 0.0;

	scanf( "%ld", &N );
	scanf( "%ld %ld", &s, &g );
	scanf( "%ld %ld", &l, &r );
	si = 0;
	for ( i = 1; si != N; ) {
		scanf( "%ld %ld", &l, &r );
//		printf( "input: %d %d\n", l, r );
		if ( newS = check(si, s, N, g, si+i, l, r) ) {
//			printf( "check!(i:%d,num:%d)\n", i, newS );
			sum += sqrt((newS-s)*(newS-s)+i*i);
			s = newS;
			si += i;
			i = 1;
		}
		else {
			i++;
		}
	}
	
	printf( "%.20lf\n", sum );
	return 0;
}

long check( long si, long s, long N, long g, long i, long l, long r ) {
	if ( i == N ) {
		return g;
	}
	if ( eProduct(s,si,g,N,l,i) ) {
		return l;
	}
	if ( eProduct(s,si,r,i,g,N) ) {
		return r;
	}
	return 0;
}

int eProduct( long ox, long oy, long p1x, long p1y, long p2x, long p2y ) {
	long long op1x = p1x-ox, op1y = p1y-oy;
	long long op2x = p2x-ox, op2y = p2y-oy;
	return op1x*op2y >= op1y*op2x;
}

Submission Info

Compile Error

./Main.c: In function ‘main’:
./Main.c:13: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result
./Main.c:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result
./Main.c:15: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result
./Main.c:18: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result

Judge Result