标签:包含 efi art 题目 i+1 lap getc length 策略
https://vjudge.net/problem/UVA-1610
给偶数个互不相同的仅包含大写字母的字符串,要求找出最短的仅包含大写字母的字符串,使一半的字符串小于等于它,一半的字符串大于它。
字符串A小于字符串B有以下情况:
1.$K=\min\{len(A),len(B)\}, \exists 0\leqslant i < K, \forall 0<=x<i, A[i]<B[i] and a[x]=b[x]$
2.$K=\min\{len(A),len(B)\}, \forall 0<=x<K, a[x]=b[x] and len(A)<len(B)$
其中大写字母从小到大顺序为“ABCDEFGHIJKLMNOPQRSTUVWXYZ”= =
又是斗智题……
改了很多次……策略很琐碎,不想解释了……
这道题应该先写暴力搜索,再对拍,这样写起来才快!
字符串长度不确定,因此应该使用string。
AC代码
#include<bits/stdc++.h> using namespace std; #define REP(r,x,y) for(register int r=(x); r<(y); r++) #define REPE(r,x,y) for(register int r=(x); r<=(y); r++) #ifdef sahdsg #define DBG(...) printf(__VA_ARGS__) #else #define DBG(...) #endif #define MAXN 1007 string k[MAXN]; int main() { #ifdef sahdsg // freopen("in.txt", "r", stdin); #endif int n; while(cin>>n && n) { REP(i,0,n) { cin >> k[i]; } sort(k,k+n); int f=(n-1)/2; //f f+1 int l1 = k[f].length(), l2 = k[f+1].length(); if(l1>l2) { string ans; ans=k[f]; REP(i,0,l2) { if(k[f][i]+1<k[f+1][i]) { ans[i]=k[f][i]+1; ans[i+1]=0; break; } else if(k[f][i]+1==k[f+1][i]) { if(i==l2-1) for(i++; i<l1-1; i++) { if(ans[i]<‘Z‘) { ans[i]=k[f][i]+1; ans[i+1]=0; break; } } else { ans[i]=k[f+1][i]; ans[i+1]=0; } break; } } puts(ans.c_str()); } else { //l1<=l2 s1<s2 string ans; ans=k[f]; int l=k[f].length(); REP(i,0,l1-1) { if(k[f][i]<k[f+1][i]) { ans[i]=k[f][i]+1; ans[i+1]=0; break; } } puts(ans.c_str()); } } return 0; }
对拍代码
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math") #include<bits/stdc++.h> using namespace std; FILE *f; int main() { srand(time(NULL) ^ (unsigned long long)new char()); while(1) { f= fopen("in.txt", "w"); fputc(‘2‘, f); fputc(‘\n‘, f); int k=rand()%100; for(int _=0; _<k; _++) { fputc(‘A‘+rand()%26, f); } fputc(‘\n‘, f); k=rand()%100; for(int _=0; _<k; _++) { fputc(‘A‘+rand()%26, f); } fputc(‘\n‘, f); fclose(f); putchar(‘.‘); system("oj < in.txt > out.txt"); putchar(‘.‘); system("bl < in.txt > out2.txt"); printf("[v]");putchar(‘\n‘); if (system("fc out.txt out2.txt")) { putchar(‘!‘); putchar(‘\a‘); getchar(); } } return 0; }
标签:包含 efi art 题目 i+1 lap getc length 策略
原文地址:https://www.cnblogs.com/sahdsg/p/10500018.html