题目链接:https://codeforces.com/contest/33/problem/B
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cctype>
#include <cmath>
#include <climits>
#include <cstring>
#include <vector>
#include <string>
#include <queue>
#include <stack>
#include <deque>
#include <set>
#include <map>
#include <bitset>
#include <unordered_set>
#include <unordered_map>
#include <algorithm>
using namespace std;
#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define lowbit(x) (x & (-x))
#define CASET int _; scanf("%d", &_); for(int kase=1;kase<=_;kase++)
typedef double db;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> PII;
static const int INF=0x3f3f3f3f;
static const ll INFL=0x3f3f3f3f3f3f3f3f;
static const db EPS=1e-10;
static const db PI=acos(-1.0);
static const int MOD=1e9+7;
template <typename T>
inline void read(T &f) {
f = 0; T fu = 1; char c = getchar();
while (c < '0' || c > '9') { if (c == '-') { fu = -1; } c = getchar(); }
while (c >= '0' && c <= '9') { f = (f << 3) + (f << 1) + (c & 15); c = getchar(); }
f *= fu;
}
template <typename T>
void print(T x) {
if (x < 0) putchar('-'), x = -x;
if (x < 10) putchar(x + 48);
else print(x / 10), putchar(x % 10 + 48);
}
static const int MAXN=1e5+10;
static const int MAXM=26+10;
int d[MAXM][MAXM];
char s1[MAXN],s2[MAXN];
int n;
int main()
{
scanf("%s%s",s1+1,s2+1);
int len1=strlen(s1+1),len2=strlen(s2+1);
if(len1!=len2)
{
puts("-1");
return 0;
}
read(n);
memset(d,0x3f,sizeof(d));
for(int i=0;i<26;i++) d[i][i]=0;
for(int i=1;i<=n;i++)
{
char u,v; int w;
scanf(" %c %c%d",&u,&v,&w);
d[u-'a'][v-'a']=min(d[u-'a'][v-'a'],w);
}
for(int k=0;k<26;k++)
for(int i=0;i<26;i++)
for(int j=0;j<26;j++)
d[i][j]=min(d[i][j],d[i][k]+d[k][j]);
int ans=0;
vector<char> v;
for(int i=1;i<=len1;i++)
{
int tmp=INF;
char ch;
for(int j=0;j<26;j++)
if(d[s1[i]-'a'][j]+d[s2[i]-'a'][j]<tmp)
{
tmp=d[s1[i]-'a'][j]+d[s2[i]-'a'][j];
ch=j+'a';
}
if(tmp==INF)
{
puts("-1");
return 0;
}
ans+=tmp;
v.push_back(ch);
}
printf("%d\n",ans);
for(int i=0;i<v.size();i++) printf("%c",v[i]);
return 0;
}

本文详细解析了CodeForces平台上的一个经典算法题目,通过Floyd算法求解两个字符串之间的最小转换代价,涉及图的最短路径问题。文章提供了完整的C++代码实现,并展示了如何高效地解决此类问题。
224

被折叠的 条评论
为什么被折叠?



