Stas and the Queue at the Buffet
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Stas and the Queue at the Buffet
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https://codeforces.com/contest/1151/problem/D
題意:
C++版本一
題解:
1、根據a和b的關系分類a>b的在前面,因為越前面,對a的權值越大,所以要使得a的值越小,同理使得越后面b越小;
2、如果1中大小關系相同,根據a,b的差值大小排序,代價問題,如果相鄰兩個交換位置,意味著前面一個+a-b,后面一個-a*b,根據1的思想分類以后,需要按差值大小排序;
/* *@Author: STZG *@Language: C++ */ #include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUG #define RI register int #define endl "\n" using namespace std; typedef long long ll; //typedef __int128 lll; const int N=100000+10; const int M=100000+10; const int MOD=1e9+7; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; int t,n,m,k,p,l,r,u,v; ll ans,cnt,flag,temp,sum; int a[N]; char str; struct node{ll a,b;bool operator <(const node &S)const{if((a<b)==(S.a<S.b)){if(a<b){return b-a<S.b-S.a;}else{return a-b>S.a-S.b;}}return (a<b)<(S.a<S.b);} }e[N]; int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endif//ios::sync_with_stdio(false);//cin.tie(0);//cout.tie(0);//scanf("%d",&t);//while(t--){scanf("%d",&n);for(int i=1;i<=n;i++){scanf("%I64d%I64d",&e[i].a,&e[i].b);}sort(e+1,e+n+1);for(int i=1;i<=n;i++){//cout<<e[i].a<<" "<<e[i].b<<endl;ans+=e[i].a*(i-1)+e[i].b*(n-i);}cout<<ans<<endl;//}#ifdef DEBUGprintf("Time cost : %lf s\n",(double)clock()/CLOCKS_PER_SEC); #endif//cout << "Hello world!" << endl;return 0; }C++版本二
題解:對版本一的化簡
因為一些簡單的數學性質
/* *@Author: STZG *@Language: C++ */ #include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUG #define RI register int #define endl "\n" using namespace std; typedef long long ll; //typedef __int128 lll; const int N=100000+10; const int M=100000+10; const int MOD=1e9+7; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; int t,n,m,k,p,l,r,u,v; ll ans,cnt,flag,temp,sum; int a[N]; char str; struct node{ll a,b;bool operator <(const node &S)const{return b-a<S.b-S.a;} }e[N]; int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endif//ios::sync_with_stdio(false);//cin.tie(0);//cout.tie(0);//scanf("%d",&t);//while(t--){scanf("%d",&n);for(int i=1;i<=n;i++){scanf("%I64d%I64d",&e[i].a,&e[i].b);}sort(e+1,e+n+1);for(int i=1;i<=n;i++){//cout<<e[i].a<<" "<<e[i].b<<endl;ans+=e[i].a*(i-1)+e[i].b*(n-i);}cout<<ans<<endl;//}#ifdef DEBUGprintf("Time cost : %lf s\n",(double)clock()/CLOCKS_PER_SEC); #endif//cout << "Hello world!" << endl;return 0; }?
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