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#include <iostream> #include <vector> using namespace std; int main() { int n; cin >> n; vector<int> v(100000, 0); for(int i = 0; i < n; i++) { string S, E; cin >> S >> E; int h = (S[0] - '0') * 10 + (S[1] - '0'); int m = (S[3] - '0') * 10 + (S[4] - '0'); int s = (S[6] - '0') * 10 + (S[7] - '0'); int t = h * 3600 + m * 60 + s; v[t]++; h = (E[0] - '0') * 10 + (E[1] - '0'); m = (E[3] - '0') * 10 + (E[4] - '0'); s = (E[6] - '0') * 10 + (E[7] - '0'); t = h * 3600 + m * 60 + s; v[t + 1]--; } int sum = 0; int res = 0; for(int i = 0; i < 100000; i++) { sum += v[i]; res = max(res, sum); } cout << res << endl; return 0; }
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