2017 ACM-ICPC 亚洲区(乌鲁木齐赛区)网络赛E Half-consecutive Numbers
time limit2000msmemory limit131072KBThe numbers 1 , 3 , 6 , 10 , 15 , 21 , 28 , 36 , 45 and t(i) = [i(i + 1) ] / 2, are called half-consecutive.For given N , find the smalle