Codeforces Round #261 (Div. 2) D 树状数组应用_html/css_WEB-ITnose
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2022-04-03 09:05:09
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看着题意:[1,i]中等于a[i]的个数要大于[,jn]中等于a[j]的个数 且i
int n;int aa[1000000 + 55];int bb[1000000 + 55];int c[1000000 + 55];mapmp;ll lowbit(ll x) { return x&(-x);}void add(int i,int val) { while(i =1;i--) { add(bb[i],-1); mp[aa[i]]++; int tmp = mp[aa[i]]; ans += i - get_sum(tmp) - 1; } cout
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