voidsolve(){ ll n; cin >> n; ll ans = n * (n -1) /2; map<ll, ll>mp;for(inti =1; i <= n; ++i) { ll x; cin >> x; mp[x]++; }for(autox : mp) ans -= x.second * (x.second -1) /2; cout << ans; } D - KAIBUNsyo 在数组A中有n个正整数,给定一种操作: ...
13. D - KAIBUNsyo 在数组\(A\)中有\(n\)个正整数,给定一种操作: 选择\(x\)和\(y\),将数组中全部\(x\)替换为\(y\) 请问最少次数是多少可以使得数组$A $ 回文 首先一个重要的点: 对于每一个\(A_i \not= A_{N+1-i}\)的数对,最终都会被某一个相同的数替代 让我们将其视为连接无向...
Hey, just a small request... I tried to solve F (https://atcoder.jp/contests/abc206/tasks/abc206_f) by DP. This is what I tried. My understanding for intersecting is, Two intervals A, B are said to intersect if there is atleast one real number x such that x belongs to both A...
abc021 D - 多重ループ 二項係数 agc025 B - RGB Coloring 二項係数, 素因数分解 arc077 D - 11 二項係数 arc116 C - Multiple Sequences 二項係数, 素因数分解 practice2 B - Fenwick Tree Binary Indexed Tree abc038 D - プレゼント Binary Indexed Tree abc036 C - 座圧 座標圧...
AtCoder Beginner Contest 217 D~E 比赛链接:Here ABC水题, D - Cutting Woods 题意:开始一根木棒长度为 \(n\) 并以 \(1\) 为单位在木棒上标记$(1\sim n)$ ,输出 \(q\) 次操作 操作 \(1\) 断开 \(x\) 所在的木棒:\([1,n]\) 在 \(x\) 断开变成了 \([1 ... 割点 时间复杂度 数...
AC代码:https://atcoder.jp/contests/abc300/submissions/41227471 题意: 有多少不大于N的正整数可以表示为a^2×b×c^2,其中三个素数a、b和c,满足a<b<c? 题解: 数论 #include"stdafx.h"#include<iostream>#include<cstdio>#include<cstring>#include<algorithm>#include<vector>#include<stack>usingnamespa...
ABC351 22 23 106 352 199 122 902 ABC352 27 43 49 90 196 989 188 ABC353 24 79 172 88 206 1161 313 (minimum) 15 23 49 74 177 122 188 (prefix sum) 15 38 87 161 338 460 648 Note that to get first-AC in a problem doesn't require you to solve all the problems before it. ...
#include<cstdio>#include<cstring>#include<algorithm>#include<queue>#include<vector>usingnamespacestd;typedeflonglongll;constintMaxn=110000;intmain(){// freopen("test.in","r",stdin);intn;scanf("%d",&n);if(n==63)puts("a1 b1 c1 d1 e1 f1 g1 h1 h2 g2 f2 e2 d2 c2 b2 a2 a3 ...
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ABC270_A.py ABC270_B.py ABC270_C.py ABC270_D.py ABC270_E.py ABC270_F.py ABC270_G.py 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 400 ABC_別解 AGC AHC ARC EDPC OTHERS memo 競プロ典型90題...