47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
#include <iostream>
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#include <cstring>
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#include <cstdio>
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#include <algorithm>
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using namespace std;
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__int64 dp[2200][2200];
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__int64 num[2200];
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bool mark[2200][2200];
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int N, Q;
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int main(){
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while( scanf( "%d", &N ) != EOF ){
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for( int i = 0; i <= 2 * N - 2; i++ ){
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scanf( "%I64d", &num[i] );
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}
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memset( mark, false, sizeof( mark ) );
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for( int i = 0; i <= N - 1; i++ ){
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for( int j = 2 * N - 2; j >= N - 1; j-- ){
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if( mark[i][j] ) continue;
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__int64 sum = 0;
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int t1 = i, t2 = j, t3 = N;
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while( t3-- ){
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sum += num[t1++] * num[t2--];
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}
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dp[i][j] = sum;
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mark[i][j] = true;
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t1 = i + 1, t2 = j - 1;
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while( t1 <= N - 1 && t2 >= N - 1 ){
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sum = sum - num[t1-1] * num[t2+1] + num[t1+N-1] * num[t2-N+1];
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dp[t1][t2] = sum;
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mark[t1][t2] = true;
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t1++, t2--;
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}
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}
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}
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scanf( "%d", &Q );
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__int64 ans = 0, ans1 = 0;
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int r, c;
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while( Q-- ){
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scanf( "%d%d", &r, &c );
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ans1 = dp[N-1-(r+ans1)%N][N-1+(c+ans1)%N];
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ans += ans1;
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}
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printf( "%I64d\n", ans );
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}
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return 0;
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}
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