提出 #8578653

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ソースコード 拡げる

#define DEB
#include <map>
#include <set>
#include <iostream>
#include <vector>
#include <string>
#include <cassert>

#define REP(i,m) for(int i=0;i<(m);++i)
#define REPN(i,m,in) for(int i=(in);i<(m);++i)
#define ALL(t) (t).begin(),(t).end()
#define CLR(a) memset((a),0,sizeof(a))
#define pb push_back
#define mp make_pair
#define fr first
#define sc second

using namespace std;


#ifdef DEB
#define dump(x)  cerr << #x << " = " << (x) << endl
#define prl cerr<<"called:"<< __LINE__<<endl
#define dumpR(x) cerr<<"\x1b[31m"<<#x<<" = " <<(x)<<"\x1b[39m"<<endl
#define dumpY(x) cerr<<"\x1b[33m"<<#x<<" = " <<(x)<<"\x1b[39m"<<endl
#define dumpG(x) cerr<<"\x1b[32m"<<#x<<" = " <<(x)<<"\x1b[39m"<<endl
template<class T> void debug(T a,T b){ for(;a!=b;++a) cerr<<*a<<' ';cerr<<endl;}
#else
#define dump(x) ;
#define dumpR(x) ;
#define dumpY(x) ;
#define dumpG(x) ;
#define prl ;
template<class T> void debug(T a,T b){ ;}
#endif

template<class T> bool chmin(T& a,const T& b) {
    if(a>b) {
        a=b;
        return true;
    }
    return false;
}
template<class T> bool chmax(T& a,const T& b) {
    if(a<b){
        a=b;
        return true;
    }
    return false;
}

typedef long long int lint;
typedef pair<lint,lint> pi;

namespace std{
    template<class S,class T>
    ostream &operator <<(ostream& out,const pair<S,T>& a){
        out<<'('<<a.fr<<','<<a.sc<<')';
        return out;
    }
}

//const int INF=5e8;


int n;
lint d[200005];
lint c[200005];
int main(){
    cin>>n;
    lint tot=0;
    lint dig=0;
    REP(i,n){
        cin>>d[i]>>c[i];
        tot+=d[i]*(lint)c[i];
        dig+=c[i];
    }
    lint res=(tot-1)/9+dig-1;
    cout<<res<<endl;


    return 0;
}

提出情報

ジャッジ結果