错因

1.超时
2.开int会爆掉 一点要看数据 开long long
https://ac.nowcoder.com/acm/contest/95480/E

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

ll aaa[26];
ll bbb[1000010][26];
int main() {

    ll n ;
    cin >> n;

    for (ll i = 0 ; i < n ; i++) {
        int cishu;
        char zimu;

        cin >> cishu >> zimu ;

        bbb[i][zimu - 'a'] = cishu; //存入每一组的字母和次数
        aaa[zimu - 'a'] += cishu; //存入单个字母出现的总次数


    }

    int m ;
    cin >> m;

    ll cnt = 0;
    if (m == 1) {
        char k1;
        cin >> k1;
        cnt = aaa[k1 - 'a'];

    } else {
        char k1, k2;
        cin >> k1 >> k2;

        if (k1 != k2) {

            for (ll i = 0 ; i < n; i++) {

                if (bbb[i][k1 - 'a'] != 0 && bbb[i + 1][k2 - 'a'] != 0) cnt++;

            }


        } else {

            for (ll i = 0; i < n ; i++) {
                if (bbb[i][k1 - 'a'] != 0)cnt += bbb[i][k1 - 'a'] - 1;

            }
        }


    }
    cout << cnt;

    return 0;
}