29行中把string全部转成lowercase, 我记得之前写成

transform(school.begin(), school.end(), ::tolower);

是可行的，不知道为什么这次编译不过，改成下面这样才行。迷惑不解。

transform(school.begin(), school.end(), school.begin(), tolower);

整体代码如下：

#include <vector>
#include <algorithm>
#include <iostream>
#include <string>
#include <unordered_map>int N, score, cnt, rank;
std::string id, school;
std::unordered_map<std::string, int> m;struct sch{std::string schCode;double tws = 0.0;int Ns = 0;sch(std::string _str): schCode(_str){}
};std::vector<sch> res;bool cmp(const sch &a, const sch &b){return (int)a.tws != (int)b.tws ? (int)a.tws > (int)b.tws : (a.Ns != b.Ns ? a.Ns < b.Ns : a.schCode < b.schCode);
}int main(){std::cin >> N;cnt = 0;for(int i = 0; i < N; ++i){std::cin >> id >> score >> school;transform(school.begin(), school.end(), school.begin(), tolower);if(m.find(school) == m.end()){m[school] = cnt++;res.push_back(sch(school));}++res[m[school]].Ns;if(id[0] == 'B'){res[m[school]].tws += score / 1.5;}else if(id[0] == 'A'){res[m[school]].tws += score;}else{res[m[school]].tws += 1.5 * score;}}std::cout << res.size() << std::endl;sort(res.begin(), res.end(), cmp);rank = 1;std::cout << rank << " " << res[0].schCode << " " << (int)res[0].tws << " " << res[0].Ns << std::endl;for(int i = 1; i < res.size(); ++i){if((int)res[i].tws != (int)res[i - 1].tws){rank = i + 1;}std::cout << rank << " " << res[i].schCode << " " << (int)res[i].tws << " " << res[i].Ns << std::endl;}return 0;
}

题目如下：

After each PAT, the PAT Center will announce the ranking of institutions based on their students' performances. Now you are asked to generate the ranklist.

Input Specification:

Each input file contains one test case. For each case, the first line gives a positive integer N (≤105), which is the number of testees. Then N lines follow, each gives the information of a testee in the following format:

ID Score School

where ID is a string of 6 characters with the first one representing the test level: B stands for the basic level, A the advanced level and T the top level; Score is an integer in [0, 100]; and School is the institution code which is a string of no more than 6 English letters (case insensitive). Note: it is guaranteed that ID is unique for each testee.

Output Specification:

For each case, first print in a line the total number of institutions. Then output the ranklist of institutions in nondecreasing order of their ranks in the following format:

Rank School TWS Ns

where Rank is the rank (start from 1) of the institution; School is the institution code (all in lower case); ; TWS is the total weighted score which is defined to be the integer part of ScoreB/1.5 + ScoreA + ScoreT*1.5, where ScoreX is the total score of the testees belong to this institution on level X; and Ns is the total number of testees who belong to this institution.

The institutions are ranked according to their TWS. If there is a tie, the institutions are supposed to have the same rank, and they shall be printed in ascending order of Ns. If there is still a tie, they shall be printed in alphabetical order of their codes.

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1141 PAT Ranking of Institutions （PAT甲级）

题目如下：

Input Specification:

Output Specification:

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