TOJ : 2844.Emergency Mission

2844：http://acm.tju.edu.cn/toj/showp2844.html

int n, m, k, ans;
vector v;
void solve() {
    v.clear();
    ans = 0;
    inc(i, 0, n+m) {
        int a, b, c;
        cii(a, b); cit(c);
        ans += (c+k-1)/k*b;
        if(i >= n) c = -c;
        v.puck(pii(a, c));
    }
    sort(v.begin(), v.end());
    int t, t1, t2;
    t1 = t2 = 0;
    inc(i, 0, v.size()) {
        t = (abs(t2)+k-1)/k;
        if(t == 0) t++;
        ans += t*(v[i].first-t1);
        t2 += v[i].second;
        t1 = v[i].first; 
    }
    pit(ans<<1);
} 
int main() {
    while(~scanf("%d%d%d", &n, &m, &k), n+m+k) {
        solve();
    }
}