Star's Blog

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map<LL, int> mp;
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for (int i = 1; i <= n; ++i) {
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    scanf("%lld", &a[i]);
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    mp[a[i]];
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}
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int m = 0;
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for (auto &[_, val] : mp) val = ++m;
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...
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printf("%lld 的下标是 %d\n", val, mp[val]);

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vector<LL> values;
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int m = 0;
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for (int i = 1; i <= n; ++i) {
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    scanf("%lld", &a[i]);
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    values.emplace_back(a[i]);
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}
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sort(values.begin(), values.end());
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int m = unique(values.begin(), values.end()) - values.begin();
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...
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printf("%lld 的下标是 %d\n", val, lower_bound(values.begin(), values.begin() + m, val) - values.begin() + 1);