
-10^7<=xi<=10^7
 -10^7<= Xi,yi<= 10^7
 0 < mi< 1000</div></div></div></div></div><div class="row"><div class="column"><h4 class="ui top attached block header">输出格式</h4><div class="ui bottom attached segment font-content"><div style="position: relative; overflow: hidden;"><div class=content>输出三角形覆盖的总面积,答案保留一位小数</div></div></div></div></div><div class="row"><div class="column"><h4 class="ui top attached block header">样例</h4><div class="ui bottom attached s