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48 lines
1.0 KiB
C++
48 lines
1.0 KiB
C++
#include <cctype>
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#include <cstdint>
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#include <cstdio>
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#include <cstring>
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void getint(int &x)
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{
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x = 0;
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int ch;
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while (!isdigit(ch = getchar()))
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;
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while (isdigit(ch))
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x = x * 10 + ch - '0',
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ch = getchar();
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}
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int n, m, r[1000001], d[1000001], s[1000001], t[1000001];
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int64_t a[1000001];
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bool check(int x)
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{
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memset(a, 0, sizeof(a));
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for (int i = 1; i <= x; i++)
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a[s[i]] += d[i], a[t[i] + 1] -= d[i];
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for (int i = 1; i <= n; i++)
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{
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a[i] += a[i - 1];
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if (a[i] > r[i]) return false;
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}
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return true;
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}
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int main()
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{
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getint(n), getint(m);
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for (int i = 1; i <= n; i++) getint(r[i]);
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for (int i = 1; i <= m; i++) getint(d[i]), getint(s[i]), getint(t[i]);
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int _l = 0, _r = m + 1, _m;
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while (_l < _r)
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{
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_m = (_l + _r) >> 1;
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if (check(_m))
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_l = _m + 1;
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else
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_r = _m;
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}
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if (_r == m + 1)
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putchar('0');
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else
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printf("-1\n%d", _l);
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return 0;
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} |