mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
63 lines
1.5 KiB
C++
63 lines
1.5 KiB
C++
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#include <cstdio>
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#include <cstring>
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using namespace std;
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#define maxn 1000
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#define max (1<<29)
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typedef __int64 ll;
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const ll inf = (1ll)<<50;
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int t, n, m, s, a, i, j, u, v, w, now, tmp1, tmp2;
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int dis[maxn][maxn];
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ll best[maxn];
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ll cost, k21, k22;
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bool vis[maxn];
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int head, tail;
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int q[maxn*maxn];
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bool flag;
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int main() {
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scanf("%d", &t);
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for (int cases = 1; cases <= t; cases++) {
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scanf("%d %d %d %d", &n, &m, &s, &a);
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for (i = 0; i < n; i++)
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for (j = 0; j < n; j++)
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dis[i][j] = -1;
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for (i = 0; i < m; i++) {
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scanf("%d %d %d", &u, &v, &w);
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dis[u][v] = dis[v][u] = w;
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}
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head = 1; tail = 1; q[1] = a;
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for (i = 0; i < n; i++) best[i] = inf;
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for (i = 0; i < n; i++) vis[i] = false;
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best[a] = 0;vis[a] = true;
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while (head <= tail) {
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now = q[head];
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for (i = 0; i < n; i++)
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if ((dis[now][i] != -1) && (dis[now][i]*3 <= s)) {
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if ( best[now]+3*dis[now][i] <= s) {
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cost = best[now]+2*dis[now][i];
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flag = true;
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} else {
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tmp1 = s-3*dis[now][i];
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tmp2 = s-5*dis[now][i];
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if(tmp2 > 0){
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k21 = (best[now]-tmp1)/tmp2;
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k22 = (best[now]-tmp1)%tmp2;
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cost = 1ll*(s-dis[now][i])*(1+k21)+1ll*(k22!=0)*(k22+4*dis[now][i]);
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flag = true;
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} else flag = false;
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}
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if (flag && cost < best[i]){
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best[i] = cost;
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if (!vis[i]) {
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vis[i] = true;
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q[++tail] = i;
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}
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}
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}
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head++; vis[now] = false;
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}
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if (best[0] == inf) { printf("Case %d: Poor princess, we will miss you!\n", cases); } else {
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printf("Case %d: %I64d\n", cases, best[0]);
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}
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}
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}
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