August 2017
Intermediate to advanced
360 pages
8h 35m
Chinese
Content preview from 算法技术手册（原书第2 版）
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图算法
｜
155
图算法
//
注意，计算使用长整型以避免无穷大距离导致溢出。
for (int j = 0; j < n; j++) {
long newLen = dist[i][k];newLen += dist[k][j];
if (newLen < dist[i][j]) {
dist[i][j] = newLen;
pred[i][j] = pred[k][j];
}
}
}
}
}
例
6-7
中的函数构建了从
s
到
t
的实际最短路径（最短路径可能多于
1
条）。它可以依
据
pred
矩阵还原最短路径。
例
6-7
：从计算出的
pred[][]
数组还原最短路径
/**
*
借助
allPairsShortest
执行的
pred
结果，按照顶点列表的方式输出从
s
到
t
的最短路径
*
注意
，
s
和
t
必须是有效的顶点描述符。如果
s
和
t
之间不存在任何路径，那么返回空路径
*/
void constructShortestPath(int s, int t, /*
输入
*/
vector< vector<int> > const &pred, /*
输入
*/
list<int> &path) { /*
输出
*/
path.clear();
if (t < 0 || t >= (int) pred.size() || s < 0 ||
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