https://codeforces.com/contest/1131/problem/B

題解：

/* *@Author: STZG *@Language: C++ */ #include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUG #define RI register int using namespace std; typedef long long ll; //typedef __int128 lll; const int N=100000+10; const int MOD=1e9+7; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; int t,n,m,k,q; ll ans,cnt,flag,temp; ll a,b,x,y; char str; int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endifscanf("%d",&n);ans=1;for(int i=1;i<=n;i++){scanf("%I64d%I64d",&a,&b);int low=max(x,y);if(x==y)low++;int high=min(a,b);ans+=(high-low+1>0?high-low+1:0);x=a,y=b;}cout << ans << endl;//scanf("%d",&t);//while(t--){}//cout << "Hello world!" << endl;return 0; }

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