Compiler output
prog.cpp: In function 'void check()':
prog.cpp:10:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (k=0; k<x.size(); k++) if (sqr(xx-x[k])+sqr(yy-y[k])<sqr(2)-eps) break;
^
prog.cpp:11:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if (k<x.size()) return;
^
prog.cpp: In function 'int main()':
prog.cpp:21:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (i=0; i<x.size() && !was; i++) for (j=0; j<i && !was; j++) {
^
