https://codeforces.com/contest/1141/problem/E?

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=200000+10; const int M=100000+10; const int MOD=1e9+7; const double PI = acos(-1.0); const double EXP = 1E-8; const ll INF = 0x3f3f3f3f3f3f3f3f; int t,n,m,k,q; unsigned long long ans; ll cnt,flag,temp,sum; ll h; int a[N]; char str; struct node{}; int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endif//ios::sync_with_stdio(false);//cin.tie(0);//cout.tie(0);//scanf("%d",&t);//while(t--){scanf("%I64d%d",&h,&n);ll H=h;ll minl=INF;for(int i=1;i<=n;i++){scanf("%d",&a[i]);sum+=a[i];minl=min(minl,sum);if(h+sum<=0){cout<<i<<endl;return 0;}}if(minl>=0||sum>=0){cout<<-1<<endl;return 0;}cnt=(H+minl)/-sum;if((H+minl)%-sum)cnt++;ans=(unsigned long long)cnt*n;h=H+sum*cnt;if(h<=0){cout<<ans<<endl;return 0;}for(int i=1;i<=n;i++){h+=a[i];if(h<=0){cout<<ans+i<<endl;return 0;}}//}#ifdef DEBUGprintf("Time cost : %lf s\n",(double)clock()/CLOCKS_PER_SEC); #endif//cout << "Hello world!" << endl;return 0; }

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