【AtCoder】全國統一プログラミング王決定戦予選/NIKKEI Programming Contest 2019
阿新 • • 發佈:2019-02-05
span 4 sum sub c++ turn ins gin ack del
感覺最近好頹,以後不能這麽頹了,要省選了,爭取省選之前再板刷一面ATC???
A - Subscribers
簡單容斥
#include <bits/stdc++.h> #define fi first #define se second #define pii pair<int,int> #define mp make_pair #define pb push_back #define space putchar(‘ ‘) #define enter putchar(‘\n‘) #define MAXN 20000005 #define eps 1e-10 //#define ivorysi using namespace std; typedef long long int64; typedef unsigned int u32; typedef double db; template<class T> void read(T &res) { res = 0;T f = 1;char c = getchar(); while(c < ‘0‘ || c > ‘9‘) { if(c == ‘-‘) f = -1; c = getchar(); } while(c >= ‘0‘ && c <= ‘9‘) { res = res * 10 + c - ‘0‘; c = getchar(); } res *= f; } template<class T> void out(T x) { if(x < 0) {x = -x;putchar(‘-‘);} if(x >= 10) { out(x / 10); } putchar(‘0‘ + x % 10); } int main() { #ifdef ivorysi freopen("f1.in","r",stdin); #endif int n,a,b; read(n);read(a);read(b); out(min(a,b));space;out(max(0,a + b - n));enter; }
B - Touitsu
每一位單獨考慮,有多少個不同的字母就改這個不同個數-1次
#include <bits/stdc++.h> #define fi first #define se second #define pii pair<int,int> #define mp make_pair #define pb push_back #define space putchar(‘ ‘) #define enter putchar(‘\n‘) #define MAXN 20000005 #define eps 1e-10 //#define ivorysi using namespace std; typedef long long int64; typedef unsigned int u32; typedef double db; template<class T> void read(T &res) { res = 0;T f = 1;char c = getchar(); while(c < ‘0‘ || c > ‘9‘) { if(c == ‘-‘) f = -1; c = getchar(); } while(c >= ‘0‘ && c <= ‘9‘) { res = res * 10 + c - ‘0‘; c = getchar(); } res *= f; } template<class T> void out(T x) { if(x < 0) {x = -x;putchar(‘-‘);} if(x >= 10) { out(x / 10); } putchar(‘0‘ + x % 10); } int N; string a,b,c; int num[4]; void Solve() { read(N); cin>> a >> b >> c; int ans = 0; for(int i = 0 ; i < N ; ++i) { num[0] = a[i] - ‘a‘; num[1] = b[i] - ‘a‘; num[2] = c[i] - ‘a‘; sort(num,num + 3); int m = unique(num,num + 3) - num - 1; ans += m; } out(ans);enter; } int main() { #ifdef ivorysi freopen("f1.in","r",stdin); #endif Solve(); }
C - Different Strokes
假設第二個人全吃了,第一個人的代價就是每次\(a_{i} + b_{i}\)
第二個一口沒動
#include <bits/stdc++.h> #define fi first #define se second #define pii pair<int,int> #define mp make_pair #define pb push_back #define space putchar(‘ ‘) #define enter putchar(‘\n‘) #define MAXN 100005 #define eps 1e-10 //#define ivorysi using namespace std; typedef long long int64; typedef unsigned int u32; typedef double db; template<class T> void read(T &res) { res = 0;T f = 1;char c = getchar(); while(c < ‘0‘ || c > ‘9‘) { if(c == ‘-‘) f = -1; c = getchar(); } while(c >= ‘0‘ && c <= ‘9‘) { res = res * 10 + c - ‘0‘; c = getchar(); } res *= f; } template<class T> void out(T x) { if(x < 0) {x = -x;putchar(‘-‘);} if(x >= 10) { out(x / 10); } putchar(‘0‘ + x % 10); } int N; int a[MAXN],b[MAXN],id[MAXN]; bool vis[MAXN]; void Solve() { read(N); for(int i = 1 ; i <= N ; ++i) { read(a[i]);read(b[i]);id[i] = i; } sort(id + 1,id + N + 1,[](int s,int t){return a[s] + b[s] > a[t] + b[t];}); int64 ans = 0; for(int i = 1 ; i <= N ; ++i) { if(i & 1) ans += a[id[i]]; else ans -= b[id[i]]; } out(ans);enter; } int main() { #ifdef ivorysi freopen("f1.in","r",stdin); #endif Solve(); }
D - Restore the Tree
每個點在拓撲圖裏找一條最長路,把最長路上的路徑保留就是這棵樹
#include <bits/stdc++.h>
#define fi first
#define se second
#define pii pair<int,int>
#define mp make_pair
#define pb push_back
#define space putchar(‘ ‘)
#define enter putchar(‘\n‘)
#define MAXN 100005
#define eps 1e-10
//#define ivorysi
using namespace std;
typedef long long int64;
typedef unsigned int u32;
typedef double db;
template<class T>
void read(T &res) {
res = 0;T f = 1;char c = getchar();
while(c < ‘0‘ || c > ‘9‘) {
if(c == ‘-‘) f = -1;
c = getchar();
}
while(c >= ‘0‘ && c <= ‘9‘) {
res = res * 10 + c - ‘0‘;
c = getchar();
}
res *= f;
}
template<class T>
void out(T x) {
if(x < 0) {x = -x;putchar(‘-‘);}
if(x >= 10) {
out(x / 10);
}
putchar(‘0‘ + x % 10);
}
vector<int> to[MAXN],pre[MAXN];
int N,M,deg[MAXN],p[MAXN],fa[MAXN];
queue<int> Q;
void Solve() {
read(N);read(M);
int u,v;
for(int i = 1 ; i <= N - 1 + M ; ++i) {
read(u);read(v);
deg[v]++;
to[u].pb(v);
pre[v].pb(u);
}
for(int i = 1 ; i <= N ; ++i) {
if(!deg[i]) Q.push(i);
}
while(!Q.empty()) {
int u = Q.front();Q.pop();
for(auto v : to[u]) {
p[v] = max(p[v],p[u] + 1);
if(!(--deg[v])) Q.push(v);
}
for(auto t : pre[u]) {
if(p[t] + 1 == p[u]) fa[u] = t;
}
}
for(int i = 1 ; i <= N ; ++i) {
out(fa[i]);enter;
}
}
int main() {
#ifdef ivorysi
freopen("f1.in","r",stdin);
#endif
Solve();
}
E - Weights on Vertices and Edges
一個聯通塊合法只取決於聯通塊裏價值最大的邊
從小到大加邊,判斷某個價值的邊在比它小的邊連成的聯通塊裏是否能達到限制
然後從大到小,每次把一條邊和這個邊連著的點比它小的邊都連出來
如果發現一條邊兩個端點沒聯通,這條邊又不合法,那這條邊就得被刪掉
#include <bits/stdc++.h>
#define fi first
#define se second
#define pii pair<int,int>
#define mp make_pair
#define pb push_back
#define space putchar(‘ ‘)
#define enter putchar(‘\n‘)
#define MAXN 100005
#define eps 1e-10
//#define ivorysi
using namespace std;
typedef long long int64;
typedef unsigned int u32;
typedef double db;
template<class T>
void read(T &res) {
res = 0;T f = 1;char c = getchar();
while(c < ‘0‘ || c > ‘9‘) {
if(c == ‘-‘) f = -1;
c = getchar();
}
while(c >= ‘0‘ && c <= ‘9‘) {
res = res * 10 + c - ‘0‘;
c = getchar();
}
res *= f;
}
template<class T>
void out(T x) {
if(x < 0) {x = -x;putchar(‘-‘);}
if(x >= 10) {
out(x / 10);
}
putchar(‘0‘ + x % 10);
}
int N,M;
struct node {
int to,next,val;
}E[MAXN * 2];
int head[MAXN],sumE;
int fa[MAXN];
int64 sum[MAXN],x[MAXN];
bool vis[MAXN];
struct Enode {
int u,v,c;
}s[MAXN];
void add(int u,int v,int c) {
E[++sumE].to = v;
E[sumE].next = head[u];
E[sumE].val = c;
head[u] = sumE;
}
int getfa(int u) {
return fa[u] == u ? u : fa[u] = getfa(fa[u]);
}
void dfs(int u,int c) {
int p = getfa(u);
for(int i = head[u] ; i ; i = E[i].next) {
if(E[i].val <= c) {
int q = getfa(E[i].to);
if(q != p) {
fa[q] = p;
dfs(E[i].to,c);
}
}
}
}
void Solve() {
read(N);read(M);
for(int i = 1 ; i <= N ; ++i) read(x[i]);
int u,v,c;
for(int i = 1 ; i <= M ; ++i) {
read(u);read(v);read(c);
add(u,v,c);add(v,u,c);
s[i] = (Enode){u,v,c};
}
sort(s + 1,s + M + 1,[](Enode a,Enode b){return a.c < b.c;});
for(int i = 1 ; i <= N ; ++i) {
fa[i] = i;sum[i] = x[i];
}
int t = 1;
for(int i = 1 ; i <= M ; ++i) {
int p = getfa(s[i].u),q = getfa(s[i].v);
if(p != q) {
fa[q] = p;
sum[p] += sum[q];
}
if(i == N || s[i].c != s[i + 1].c) {
for(int j = t; j <= i; ++j) {
p = getfa(s[j].u);
if(sum[p] >= s[j].c) vis[j] = 1;
}
t = i + 1;
}
}
for(int i = 1 ; i <= N ; ++i) fa[i] = i;
int ans = 0;
for(int i = M ; i >= 1 ; --i) {
if(getfa(s[i].u) == getfa(s[i].v)) continue;
if(!vis[i]) {++ans;continue;}
dfs(s[i].u,s[i].c);
}
out(ans);enter;
}
int main() {
#ifdef ivorysi
freopen("f1.in","r",stdin);
#endif
Solve();
}
F - Jewels
每次增加1的時候
要麽就從已經選了兩個點的剩余集合裏+1
或者去掉一個已選的單個,加上一對
或者去掉一個已選的一對,加上三個
或者去掉三個,扔兩個對,可以通過去掉一個然後把剩余選的對用未選的對更新一下。。
#include <bits/stdc++.h>
#define fi first
#define se second
#define pii pair<int,int>
#define mp make_pair
#define pb push_back
#define space putchar(‘ ‘)
#define enter putchar(‘\n‘)
#define MAXN 200005
#define eps 1e-10
//#define ivorysi
using namespace std;
typedef long long int64;
typedef unsigned int u32;
typedef double db;
template<class T>
void read(T &res) {
res = 0;T f = 1;char c = getchar();
while(c < ‘0‘ || c > ‘9‘) {
if(c == ‘-‘) f = -1;
c = getchar();
}
while(c >= ‘0‘ && c <= ‘9‘) {
res = res * 10 + c - ‘0‘;
c = getchar();
}
res *= f;
}
template<class T>
void out(T x) {
if(x < 0) {x = -x;putchar(‘-‘);}
if(x >= 10) {
out(x / 10);
}
putchar(‘0‘ + x % 10);
}
struct node {
int pos;int64 v;
friend bool operator < (const node &a,const node &b) {
return a.v > b.v || (a.v == b.v && a.pos < b.pos);
}
};
set<node> S,D,T,CD,CS;
vector<int64> ver[MAXN];
int p[MAXN],N,K;
int64 ans,rec[MAXN];
void Choose_one() {
node t = *S.begin();S.erase(S.begin());CS.insert(t);
ans += t.v;
++p[t.pos];
if(p[t.pos] <= ver[t.pos].size() - 1) {
S.insert((node){t.pos,ver[t.pos][p[t.pos]]});
}
}
void Delete_one() {
node t = *(--CS.end());CS.erase(--CS.end());
ans -= t.v;
if(p[t.pos] <= ver[t.pos].size() - 1) {
S.erase((node){t.pos,ver[t.pos][p[t.pos]]});
}
S.insert(t);--p[t.pos];
}
void Choose_two() {
node t = *D.begin();D.erase(D.begin());CD.insert(t);
ans += t.v;
p[t.pos] = 2;
if(p[t.pos] <= ver[t.pos].size() - 1) {
S.insert((node){t.pos,ver[t.pos][p[t.pos]]});
}
if(ver[t.pos].size() >= 3) {
T.erase((node){t.pos,ver[t.pos][0] + ver[t.pos][1] + ver[t.pos][2]});
}
}
void Delete_two() {
node t = *(--CD.end());CD.erase(--CD.end());
S.erase((node){t.pos,ver[t.pos][p[t.pos]]});
D.insert((node){t.pos,ver[t.pos][0] + ver[t.pos][1]});
if(ver[t.pos].size() >= 3) {
T.insert((node){t.pos,ver[t.pos][0] + ver[t.pos][1] + ver[t.pos][2]});
}
ans -= t.v;
}
void Choose_three() {
node t = *T.begin();T.erase(T.begin());
ans += t.v;
p[t.pos] = 3;
D.erase((node){t.pos,ver[t.pos][0] + ver[t.pos][1]});
CD.insert((node){t.pos,ver[t.pos][0] + ver[t.pos][1]});
CS.insert((node){t.pos,ver[t.pos][2]});
if(p[t.pos] <= ver[t.pos].size() - 1) {
S.insert((node){t.pos,ver[t.pos][p[t.pos]]});
}
}
void Solve() {
read(N);read(K);
int c;int64 v;
for(int i = 1 ; i <= N ; ++i) {
read(c);read(v);ver[c].pb(v);
}
for(int i = 1 ; i <= K ; ++i) {
sort(ver[i].begin(),ver[i].end(),[](int64 a,int64 b){return a > b;});
}
for(int i = 1 ; i <= K ; ++i) {
if(ver[i].size()) {
D.insert((node){i,ver[i][0] + ver[i][1]});
if(ver[i].size() >= 3) T.insert((node){i,ver[i][0] + ver[i][1] + ver[i][2]});
}
}
rec[1] = -1;ans = 0;
puts("-1");
for(int i = 2 ; i <= N ; ++i) {
if(rec[i - 1] == -1) {
Choose_two();
rec[i] = ans;
}
else {
int64 w[3] = {-1,-1,-1};
if(S.size()) {
w[0] = ans + (*S.begin()).v;
}
if(CS.size() && D.size()) {
w[1] = ans - (*(--CS.end())).v + (*D.begin()).v;
}
if(CD.size() && T.size()) {
w[2] = ans - (*(--CD.end())).v + (*T.begin()).v;
}
if(w[0] < 0 && w[1] < 0 && w[2] < 0) {rec[i] = -1;}
else {
if(w[0] >= max(w[1],w[2])) {Choose_one();}
else if(w[1] >= max(w[0],w[2])) {Delete_one();Choose_two();}
else {Delete_two();Choose_three();}
rec[i] = ans;
}
while(1) {
if(!D.size()) break;
if(!CD.size()) break;
node t = *(--CD.end());
node s = *D.begin();
if(p[t.pos] == 2) {
if(s.v > t.v) {
Delete_two();Choose_two();
}
else break;
}
else break;
rec[i] = ans;
}
}
out(rec[i]);enter;
}
}
int main() {
#ifdef ivorysi
freopen("f1.in","r",stdin);
#endif
Solve();
}
【AtCoder】全國統一プログラミング王決定戦予選/NIKKEI Programming Contest 2019