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1226. [SDOI2009]学校食堂Dining
https://hydro.ac/d/bzoj/record/6322ec6fbdf9bc31d160a0ae
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BZOJ/1226/1226.cpp
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BZOJ/1226/1226.cpp
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#include <iostream>
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#include <cstring>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 1005;
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const int INF = 0x3f3f3f3f;
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int c, n, f[N][1 << 8][20];
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std::pair<int, int> a[N];
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> c;
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while (c--) {
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memset(f, 0x3f, sizeof(f));
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cin >> n;
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for (int i = 1; i <= n; i++) {
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cin >> a[i].first >> a[i].second;
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}
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f[1][0][7] = 0;
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for (int i = 1; i <= n; i++) {
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for (int j = 0; j < 1 << 8; j++) {
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for (int k = -8; k <= 7; k++) {
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if (f[i][j][k + 8] != INF) {
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if (j & 1) { // 当前同学吃了,无需考虑后方
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f[i + 1][j >> 1][k + 7] = std::min(f[i + 1][j >> 1][k + 7], f[i][j][k + 8]);
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} else {
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int t = INF;
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for (int l = 0; l <= 7; l++) {
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if (j & 1 << l) continue;
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if (i + l > t) break;
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if (i + l <= n) t = std::min(t, i + l + a[i + l].second);
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else t = std::min(t, i + l);
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if (i + k) {
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int x = i + k <= n ? a[i + k].first : 0,
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y = i + l <= n ? a[i + l].first : 0;
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f[i][j | 1 << l][l + 8] = std::min(f[i][j | 1 << l][l + 8], f[i][j][k + 8] + (x ^ y));
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} else {
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f[i][j | 1 << l][l + 8] = std::min(f[i][j | 1 << l][l + 8], f[i][j][k + 8]);
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}
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}
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}
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}
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}
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}
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}
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int ans = INF;
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for (int i = 0; i <= 8; i++) {
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ans = std::min(ans, f[n + 1][0][i]);
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}
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cout << ans << endl;
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}
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return 0;
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}
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