Code: Select all
#include <stdio.h>
#include <stdlib.h>
int main(void) {
int dataNum = 0;
scanf("%d", &dataNum);
int i = 0;
for(i = 0; i < dataNum; ++i) {
int columnNum = 0;
scanf("%d", &columnNum);
int ableToFix = 1;
if(columnNum < 0)
ableToFix = -1;
int diff = -1;
int j = 0;
for(j = 0; j < columnNum; ++j) {
int y1, y2;
y1 = y2 = 0;
scanf("%d%d", &y1, &y2);
if(ableToFix == 1) {
int diffTemp = abs(y1 - y2);
if(diff == -1)
diff = diffTemp;
else if(diff != diffTemp)
ableToFix = -1;
}
}
if(ableToFix == 1)
printf("yes\n\n");
else
printf("no\n\n");
}
}