Problem: 1854. 人口最多的年份耗时100前缀和差和Codeclass Solution { public: vectorint tr; int maximumPopulation(vectorvectorint logs) { tr.assign(2051, 0); for(vectorint l : logs) { tr[l[0]]; tr[l[1]]--; } int mx 0, sum 0, year; for(int i 1950; i 2051; i) { sum tr[i]; if(mx sum) { mx sum; year i; } } return year; } };