codeforces222A
作者:互联网
sol:显然只有后面一串相同才行,因为只能删除前面的元素
#include <bits/stdc++.h> using namespace std; typedef int ll; inline ll read() { ll s=0; bool f=0; char ch=' '; while(!isdigit(ch)) {f|=(ch=='-'); ch=getchar();} while(isdigit(ch)) {s=(s<<3)+(s<<1)+(ch^48); ch=getchar();} return (f)?(-s):(s); } #define R(x) x=read() inline void write(ll x) { if(x<0) {putchar('-'); x=-x;} if(x<10) {putchar(x+'0'); return;} write(x/10); putchar((x%10)+'0'); } #define W(x) write(x),putchar(' ') #define Wl(x) write(x),putchar('\n') const int N=100005; int n,m,a[N]; int main() { int i,wn; R(n); R(m); for(i=1;i<=n;i++) R(a[i]); for(i=n;i>=1;i--) { if(a[i]!=a[n]) {wn=i+1; break;} else wn=i; } if(wn<=m) Wl(wn-1); else puts("-1"); return 0; }View Code
标签:ch,int,wn,ll,while,isdigit,codeforces222A 来源: https://www.cnblogs.com/gaojunonly1/p/15436947.html