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double很强……123456789101112131415存不下,都AC了…… for( int i=N ; i>=0 ; i-- ){
c[ i ]=c[ i+1 ]+i*t;
if( i>=10 ) t*=100.0;
else t*=10.0;
}
for( int i=0 ; i<=N; i++)
for( int j=i ; j<=N ; j++){
w[ i ][ j ]=c[ i ]-c[ j+1 ];
int t=0;
for( int k=j+1 ; k<=N; k++) t+=(1+(k>=10));
for( int k=1 ; k<=t; k++) w[ i ][ j ]/=10.0;
}
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