讨论/题目交流/第64题 求最小路径和 我是用迪杰斯特拉算法做的,单超限,请大佬帮忙看看,感谢/
第64题 求最小路径和 我是用迪杰斯特拉算法做的,单超限,请大佬帮忙看看,感谢

第64题 求最小路径和
我是用迪杰斯特拉算法做的,在提交的时候60/61时,时间超限,想请大佬帮忙看看。
然后想再拓展问个问题:一般时间超限是真的时间超出题目要求的时间限制了?还是说程序的问题
class Solution {
public:
auto fan(map<pair<int,int>,int>& mymap)
{
map<pair<int,int>,int>::iterator it=mymap.begin();
int m=it->second;
auto a=it->first;
for(;it!=mymap.end();it++)
{
if(it->second<m) {m=it->second; a=it->first;}
}
return a;
}
int minPathSum(vector<vector<int>>& grid) {
int r=grid.size();
int c=grid[0].size();
if(r==1&&c==1) return grid[0][0];
map<pair<int,int>,int> mymap;
mymap[{0,0}]=grid[0][0];
int i=0,j=0,m=grid[0][0];
while(1)
{
if(i+1<r)
{
if(!mymap.count({i+1,j})) mymap[{i+1,j}]=mymap[{i,j}]+grid[i+1][j];
else mymap[{i+1,j}]=min( mymap[{i+1,j}],mymap[{i,j}]+grid[i+1][j]);
if((i+2==r)&&(j==c-1)) {m=mymap[{i+1,j}]; break;}
}
if(j+1<c)
{
if(!mymap.count({i,j+1})) mymap[{i,j+1}]=mymap[{i,j}]+grid[i][j+1];
else mymap[{i,j+1}]=min(mymap[{i,j+1}],mymap[{i,j}]+grid[i][j+1]);
if((i+1==r)&&(j+2==c)) {m=mymap[{i,j+1}]; break;}
}
mymap.erase({i,j});
auto a=fan(mymap);
i=a.first;
j=a.second;
}
return m;
}
};

展开讨论
Wangxc发起于 2019-08-31
共 2 个讨论

你这个是单纯的复杂度过高过不了,我测了数据如下:

[[0,3,8,5,5,1,5,3,3,6,7,5,9,4,6,5,6,8,2,4,2,5,5,3,7,4,8,5,0,2,5,2,5,5,7,2,6,3,5,1,9,4,8,8,9,5,6,7,5,0,3,9,6,9,2,5,5,2,0,8,4,7,0,2,2,0,4,1,3,2,2,4,6,1,5,7,8,1,7,3,1,0,4,9,1,6,4,9,8,6,7,2,3,9,6,8,9,3,9,4,7,3,9,3,6,4,3,4,5,2,9,8,2,3,8,4,9,4,3,9,1,2,4,4,1,0,4,3,5,5,7,2,9,6,8,5,0,1,2,7,3,1,8,7,5,8,1,6,2,6,8,3,8,4,0,2,6,4,5,2,0,2,4,9,1,2,6,3,5,8,3,0,2,1,8,9,9,1,5,1,8,5,5,8,9,5,0,6,1,7,8,1,2,4,2,3,7,9,8,2],[9,1,3,1,4,1,0,3,4,8,7,2,3,4,1,5,1,3,3,2,1,3,6,3,7,8,8,4,9,6,9,9,0,2,0,4,5,1,0,9,9,7,4,4,1,7,1,4,0,4,8,3,7,4,6,5,3,4,1,4,3,0,3,3,4,4,7,1,7,7,1,8,6,7,2,9,4,4,3,4,0,2,0,8,8,6,5,1,3,6,6,8,9,1,1,3,5,0,5,4,0,8,2,8,5,7,8,1,3,3,7,3,7,7,3,6,4,8,9,9,7,5,7,6,9,0,9,6,2,6,1,4,6,3,3,1,2,3,2,5,8,2,1,6,9,4,2,5,3,1,4,0,9,3,8,8,5,7,4,8,6,5,4,2,1,9,6,5,4,0,1,3,2,2,9,2,6,1,7,1,4,4,3,3,9,1,3,5,1,8,5,7,5,9,9,8,9,5,4,3],[8,5,8,0,9,7,4,7,0,2,9,5,8,2,0,7,6,4,2,7,2,7,4,9,9,5,8,0,3,2,5,1,9,4,1,8,1,6,7,4,0,8,9,8,3,9,7,9,5,0,6,7,9,0,7,8,7,7,8,0,9,6,1,8,0,5,8,3,3,5,7,3,6,8,3,9,0,0,8,5,2,4,3,2,6,2,2,3,9,3,4,0,9,7,0,9,2,8,4,5,5,2,0,1,0,3,0,2,6,0,8,8,6,3,2,2,7,7,8,6,0,4,8,1,1,8,2,6,6,6,3,3,0,4,7,1,9,9,5,7,0,3,6,6,6,0,1,3,7,9,1,9,5,9,0,6,9,4,4,7,1,0,1,1,4,0,4,5,9,0,3,1,3,1,0,2,1,3,7,1,4,1,2,9,0,3,7,0,7,2,7,0,2,0,4,8,0,8,5,2],[0,8,5,6,1,5,8,3,8,7,6,2,8,8,1,1,3,1,1,3,3,0,3,7,3,7,7,5,8,2,7,8,1,3,6,2,0,6,7,1,4,5,3,2,4,7,3,9,8,6,2,3,9,8,0,4,7,9,9,7,1,9,8,4,4,4,9,4,1,8,5,5,4,1,9,0,0,5,9,8,1,4,3,2,4,5,6,1,4,6,1,5,5,9,2,9,3,1,5,4,9,1,1,3,4,1,5,4,6,5,4,9,1,7,4,5,4,0,8,8,8,1,5,3,0,7,4,4,8,2,0,0,3,4,3,9,7,9,3,5,6,9,4,9,6,0,4,2,1,4,2,9,6,7,5,6,7,1,2,7,3,5,7,8,1,1,7,8,2,2,3,0,1,9,9,9,0,3,3,3,9,5,4,7,3,9,6,2,3,0,9,8,5,7,7,6,0,6,6,2],[1,1,2,4,1,3,4,3,8,9,8,7,5,2,5,0,4,1,2,7,1,1,5,9,8,4,7,8,3,6,2,4,7,6,8,0,9,4,5,7,4,3,7,1,6,4,1,2,7,3,9,0,4,6,9,5,3,9,3,6,5,8,0,4,4,0,5,6,7,0,5,3,4,2,4,2,8,5,4,5,8,5,6,4,3,7,9,6,6,5,2,3,3,4,8,9,7,3,5,4,5,3,7,1,7,3,3,6,8,9,1,6,4,7,0,8,5,0,4,3,5,9,7,0,5,5,9,2,0,7,8,5,2,7,7,9,0,2,5,8,2,7,6,8,4,9,6,1,1,3,5,8,4,4,8,9,1,9,4,1,8,2,8,0,0,7,0,0,0,5,1,4,2,7,2,9,6,1,2,7,6,7,5,0,3,5,1,4,5,5,5,3,0,6,6,0,3,6,2,5],[3,3,9,8,1,4,7,9,5,1,9,3,1,4,3,4,2,6,9,7,4,6,2,4,2,8,4,6,6,8,1,0,2,3,8,5,7,7,6,2,0,5,5,1,2,0,6,4,8,7,3,2,3,5,6,6,6,2,4,4,1,7,4,5,0,4,2,7,3,8,1,4,4,8,7,6,0,3,2,9,0,5,3,6,0,0,4,8,4,8,3,7,5,9,2,8,6,6,5,1,5,9,7,1,7,5,9,8,0,1,9,3,6,2,9,8,4,3,9,1,3,2,8,0,3,3,8,9,9,6,3,6,5,0,7,4,7,6,4,8,9,3,1,7,8,2,8,4,7,7,5,0,1,4,2,4,9,1,6,8,7,9,7,4,9,4,8,7,3,3,7,4,8,0,2,8,2,0,3,1,9,8,1,0,4,3,4,3,6,0,4,5,1,1,9,3,7,0,2,2],[3,9,7,3,9,1,2,3,3,5,4,2,5,7,2,0,2,6,3,9,9,7,4,2,0,6,5,8,6,7,2,1,8,9,4,9,2,6,2,5,3,8,7,9,5,9,1,0,8,4,9,9,4,5,1,4,3,9,4,9,6,7,0,7,8,7,6,1,5,1,8,9,1,8,0,7,9,1,9,7,7,0,8,3,7,2,0,1,1,4,0,9,3,3,6,4,0,5,7,5,6,5,4,7,5,6,6,5,9,5,4,7,7,3,0,5,5,2,6,6,9,6,7,2,9,4,8,1,9,5,7,7,3,1,6,0,0,5,5,9,2,0,8,0,3,1,5,0,3,3,8,2,1,5,7,1,1,5,4,0,3,1,9,8,5,8,8,5,3,6,4,7,6,5,7,1,6,4,1,9,7,9,2,9,6,9,2,8,6,6,0,1,8,0,9,3,0,0,0,5],[6,6,2,2,1,2,5,7,6,6,9,6,7,1,7,3,2,1,1,0,7,2,2,7,4,3,2,6,5,2,1,1,1,3,5,2,5,0,0,4,8,9,0,5,2,9,1,6,0,2,8,9,6,0,7,2,6,1,8,1,6,9,5,7,5,0,9,2,3,1,6,3,2,8,9,6,7,0,4,9,4,3,9,3,5,6,5,1,9,6,3,5,5,0,2,2,2,4,5,5,7,1,9,2,2,0,0,9,2,5,1,8,8,0,1,3,6,9,5,7,5,0,3,2,0,7,5,2,3,0,0,1,3,1,5,5,1,5,7,5,0,8,3,0,8,5,4,6,6,1,3,1,3,8,3,5,6,0,9,1,0,1,4,4,2,9,1,5,5,8,0,7,6,6,8,6,3,4,2,9,7,6,2,0,6,5,7,2,8,6,4,8,8,8,4,0,0,6,8,7],[4,0,4,3,6,4,9,9,8,4,8,5,2,0,7,8,8,4,3,6,3,9,6,1,7,1,3,9,9,1,6,5,2,3,8,8,7,0,0,8,6,0,5,8,1,5,8,1,9,1,9,4,0,5,5,0,8,1,9,7,2,8,3,6,1,3,7,0,5,7,0,3,9,6,1,2,3,0,3,4,3,4,9,4,0,4,4,0,7,5,8,0,3,3,8,6,8,7,9,6,4,9,9,4,7,3,8,0,5,2,5,8,6,4,4,8,0,8,9,0,6,9,0,1,4,0,8,2,8,7,0,4,8,2,0,6,5,9,8,2,3,3,0,1,9,5,0,2,5,1,2,1,0,4,5,4,6,3,8,4,2,1,1,0,3,1,8,0,2,7,2,5,2,4,7,2,9,9,6,7,0,0,0,2,4,5,6,0,0,6,7,2,7,0,5,2,1,3,2,6],[2,4,3,5,9,2,9,0,1,5,9,1,7,0,3,1,7,1,3,8,0,2,2,7,2,7,2,6,3,4,4,7,1,7,2,2,0,3,4,1,0,4,5,7,6,0,0,5,4,6,3,4,8,8,3,3,5,5,1,0,2,5,8,5,2,2,7,2,6,3,6,8,7,3,6,5,3,6,1,9,2,6,5,3,4,9,8,2,6,9,2,0,4,2,5,6,7,4,1,5,8,9,3,7,2,9,3,7,8,4,7,2,2,4,7,7,3,5,9,2,4,3,2,0,8,0,9,5,4,2,2,2,1,5,0,3,7,5,2,7,1,1,9,3,6,9,0,1,4,9,3,1,5,8,1,3,8,2,0,4,4,2,9,5,9,9,0,8,6,3,5,7,6,7,0,2,6,3,4,0,4,9,3,9,7,5,2,7,9,2,2,4,6,1,1,6,2,2,4,8],[7,2,7,5,9,9,8,5,2,4,7,7,3,1,6,3,8,1,2,7,3,4,1,2,7,5,0,1,9,6,1,8,8,0,3,7,0,1,4,2,7,2,9,3,3,6,6,1,9,0,8,2,7,2,6,4,9,6,8,8,3,1,6,1,2,9,1,2,3,5,4,0,7,6,5,0,4,3,3,3,4,4,7,1,6,4,7,7,2,5,5,5,9,1,9,1,2,2,3,5,7,9,8,7,5,3,9,9,7,5,4,1,9,2,2,7,6,1,4,0,9,9,6,8,2,7,9,4,9,4,0,8,3,0,7,9,5,9,0,2,4,5,5,3,9,9,0,7,1,4,7,0,5,5,8,7,2,9,1,3,3,3,4,6,5,3,7,1,2,0,3,6,7,1,9,6,0,1,3,3,5,2,3,0,8,3,9,2,2,1,6,5,6,2,4,2,5,1,3,0],[3,8,6,0,9,8,6,0,1,1,5,7,4,1,9,4,4,1,6,9,2,4,6,0,6,0,2,4,4,5,4,7,6,2,8,5,2,6,7,4,0,3,3,4,4,4,0,0,5,6,1,9,1,8,0,9,0,4,5,6,0,1,4,8,6,4,3,8,2,1,4,2,6,7,8,2,4,8,4,9,5,6,9,8,6,1,7,6,5,5,5,7,6,1,5,2,5,9,3,7,2,7,0,0,7,0,2,1,9,6,0,4,4,1,2,0,4,1,9,0,6,4,9,5,5,5,7,2,6,2,1,0,0,3,0,7,4,4,8,3,2,0,9,7,2,1,7,6,4,8,8,3,2,8,8,9,5,7,1,3,0,3,5,0,6,5,7,0,1,7,5,3,7,4,0,1,7,0,0,2,8,0,5,3,0,3,2,7,0,6,0,0,1,5,2,7,2,1,0,3],[8,7,7,8,2,9,1,9,9,1,1,8,4,8,1,4,3,5,2,6,1,2,8,2,0,1,2,2,4,4,8,3,1,5,3,5,4,4,5,6,8,8,4,2,9,7,6,2,2,0,8,6,5,7,0,5,0,4,9,4,8,7,9,2,4,4,7,1,9,4,7,9,3,3,3,2,0,1,6,4,2,7,2,7,4,3,2,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如上数据都要跑一秒多,这个数据还远小于系统数据呢。系统给给的这些数据你都能看到的,你可以自己试着分析。

其次超时这个东西有可能是算法复杂度问题,也有可能是代码写错了导致的如死循环等,这个就看你分析纠错的能力了。

2

路过,看不懂代码。 这题我看了下是dp啊, 怎么会用dijkstra算法?