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谁帮我看看哪里错了。。老wa~~~#include <iostream> #include <fstream> using namespace std; int main() { int N; //组数 int a[21][6]={0}; int i,j; ifstream cin("1658.txt"); cin>>N; for(i=0;i<N;i++) { for(j=0;j<4;j++) { cin>>a[i][j]; } if(((a[1]-a[0])==(a[2]-a[1]))&&((a[3]-a[2])==(a[2]-a[1]))) a[i][4]=2*a[i][3]-a[i][2]; else a[i][4]=a[i][3]*((float)a[i][3]/a[i][2]); } for(i=0;i<N;i++) { for(j=0;j<5;j++) { cout<<a[i][j]; if(j<4) cout<<" "; } cout<<endl; } return 0; } Followed by:
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