제출 #1190438

#제출 시각아이디문제언어결과실행 시간메모리
1190438dzuizzLightning Rod (NOI18_lightningrod)C++20
100 / 100
230 ms76200 KiB
#include <bits/stdc++.h> using namespace std; constexpr int N=1e8; inline int read(){ #define num (ch&15) char ch; int res; while(!isdigit(ch=getchar_unlocked())); for(res=num;isdigit(ch=getchar_unlocked());res=(res<<3)+(res<<1)+num); #undef num return res; } int n,l[N],r[N],s=-1; int main(){ n=read(); for(int i=0,x,y;i<n;++i){ x=read(),y=read(); while(s>=0&&x-y<=l[s]-r[s]) --s; if(s<0||x+y>l[s]+r[s]) l[++s]=x,r[s]=y; } printf("%d\n",++s); return 0; }
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