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Cod sursa(job #215326)
#include <stdio.h>
#include <math.h>
#define DIM 100002
int V[DIM];
int M[DIM][30];
int n,m,i,j,log1,a,b;
int main(){
FILE *f = fopen("rmq.in","r");
fscanf(f,"%d %d",&n,&m);
for (i=1;i<=n;i++)
fscanf(f,"%d",&V[i]);
for (i=1;i<=n;i++)
M[i][0] = V[i];
for (j=1;(1<<j)<=n;j++) {
for (i=1;i+(1<<j)-1<=n;i++) {
if (M[i][j-1]<M[i+(1<<(j-1))][j-1])
M[i][j] = M[i][j-1];
else
M[i][j] = M[i+(1<<(j-1))][j-1];
}
}
FILE *g = fopen("rmq.out","w");
for (i=1;i<=m;i++) {
fscanf(f,"%d %d",&a, &b);
log1 = (int)log(b-a+1);
if (M[a][log1]<M[b-(1<<log1)][log1]) {
fprintf(g,"%d\n",M[a][log1]);
} else {
fprintf(g,"%d\n",M[b-(1<<log1)][log1]);
}
}
fclose(g);
fclose(f);
return 0;
}