41 lines
738 B
C
41 lines
738 B
C
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#include <stdio.h>
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struct tv_i{
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int start;
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int end;
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};
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int main(void){
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int numbers;
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struct tv_i tv[100];
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while(scanf("%d",&numbers) == 1 && numbers){
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int i, temp;
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for(i = 0; i < numbers; i++) scanf("%d %d",&tv[i].start,&tv[i].end);
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int if_change = 1;
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while(if_change){
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if_change = 0;
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for(i = 0; i < numbers-1; i++){
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if(tv[i].end > tv[i+1].end){
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temp = tv[i].end;
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tv[i].end = tv[i+1].end;
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tv[i+1].end = temp;
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temp = tv[i].start;
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tv[i].start = tv[i+1].start;
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tv[i+1].start = temp;
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if_change = 1;
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}
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}
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}
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int rtv = 0,nowt = 0;
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for(i = 0; i < numbers; i++){
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if(tv[i].start >= nowt){
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rtv++;
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nowt = tv[i].end;
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}
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}
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printf("%d\n",rtv);
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}
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return 0;
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}
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