$O(tn)$
#include<cstdio> int t, s, n; int main() { scanf("%d", &t); while (t--) { int r = 0; scanf("%d %d", &r, &n); for (int i = 0, p, q; i < n; i++) scanf("%d %d", &p, &q), r += p*q; printf("%d\n", r); } return 0; }
#include<cstdio> int t, s, n; int main() { scanf("%d", &t); while (t--) { int r = 0; scanf("%d %d", &r, &n); for (int i = 0, p, q; i < n; i++) scanf("%d %d", &p, &q), r += p*q; printf("%d\n", r); } return 0; }
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