原题面中 nnn 的范围是
1<=n<=2000;1<=n<=2000;1<=n<=2000;
而题目翻译中
n,m(1<=n<=20000,1<=m<=105) n,m (1<=n<=20000,1<=m<=10^5)n,m(1<=n<=20000,1<=m<=105)
所以是题目翻译的问题还是别的问题?