CodeForces 733B Parade
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枚举。枚举交换哪一个即可。
#pragma comment(linker, "/STACK:1024000000,1024000000") #include<cstdio> #include<cstring> #include<cmath> #include<algorithm> #include<vector> #include<map> #include<set> #include<queue> #include<stack> #include<ctime> #include<iostream> using namespace std; typedef long long LL; const double pi=acos(-1.0); void File() { freopen("D:\\in.txt","r",stdin); freopen("D:\\out.txt","w",stdout); } template <class T> inline void read(T &x) { char c = getchar(); x = 0; while(!isdigit(c)) c = getchar(); while(isdigit(c)) { x = x * 10 + c - ‘0‘; c = getchar(); } } int n; int L[100010],R[100010]; int sumL,sumR; int ans,idx; int main() { cin>>n; for(int i=1;i<=n;i++) { cin>>L[i]>>R[i]; sumL=sumL+L[i]; sumR=sumR+R[i]; } ans=abs(sumR-sumL); for(int i=1;i<=n;i++) { sumL=sumL-L[i]; sumR=sumR-R[i]; sumL=sumL+R[i]; sumR=sumR+L[i]; if(abs(sumR-sumL)>ans) { ans=abs(sumR-sumL); idx=i; } sumL=sumL-R[i]; sumR=sumR-L[i]; sumL=sumL+L[i]; sumR=sumR+R[i]; } cout<<idx<<endl; return 0; }
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