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Cod sursa(job #215365)
#include <stdio.h>
#define DIM 100001
int V[DIM],Log[DIM];
int M[18][DIM];
int n,m,i,j,log1,a,b,dljm1,dlLog1;
int main(){
FILE *f = fopen("rmq.in","r");
fscanf(f,"%d %d",&n,&m);
fscanf(f,"%d",&V[1]);
M[0][1] = V[1];
for (i=2;i<=n;i++) {
fscanf(f,"%d",&V[i]);
M[0][i] = V[i];
Log[i]=Log[i>>1]+1;
}
for (j=1;(1<<j)<n;j++) {
dljm1 = 1<<(j-1);
for (i=1;i+(1<<j)-1<=n;i++) {
if (M[j-1][i]<M[j-1][i+(dljm1)])
M[j][i] = M[j-1][i];
else
M[j][i] = M[j-1][i+(dljm1)];
}
}
FILE *g = fopen("rmq.out","w");
for (i=1;i<=m;i++) {
fscanf(f,"%d %d",&a, &b);
log1 = Log[b-a+1];
dlLog1 = (1<<log1);
if (M[log1][a]<M[log1][b-(dlLog1)+1]) {
fprintf(g,"%d\n",M[log1][a]);
} else {
fprintf(g,"%d\n",M[log1][b-(dlLog1)+1]);
}
}
fclose(g);
fclose(f);
return 0;
}