本来想用线段树做的，仔细看题发现题目数据太弱了，直接用一个数组标记平面上每一个单位方格即可，水题~

/*  * hdu1264/linux.cpp  * Created on: 2011-9-1  * Author    : ben */ #include 
     
       #include 
      
        #include 
       
         #include 
        
          #include 
         
           using namespace std; const int MAX_COR = 105; bool map[MAX_COR][MAX_COR]; void work() {
    int t, xi, yi, xa, ya; while (true) {
            memset(map, false, sizeof(map)); while (true) {
                scanf("%d%d%d%d", &xi, &yi, &xa, &ya); if (xi == -1 && yi == -1 && xa == -1 && ya == -1) {
    break;             } if (xi == -2 && yi == -2 && xa == -2 && ya == -2) {
    break;             } if (xi > xa) {
                    t = xi;                 xi = xa;                 xa = t;             } if (yi > ya) {
                    t = yi;                 yi = ya;                 ya = t;             } for (int i = xi; i < xa; i++) {
    for (int j = yi; j < ya; j++) {
                        map[i][j] = true;                 }             }         }         t = 0; for (int i = 0; i < MAX_COR; i++) {
    for (int j = 0; j < MAX_COR; j++) {
                    t += map[i][j];             }         }         printf("%d\n", t); if (xi == -2 && yi == -2 && xa == -2 && ya == -2) {
    break;         }     } } int main() {
    #ifndef ONLINE_JUDGE     freopen("data.in", "r", stdin); #endif     work(); return 0; }