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Cod sursa(job #51591)
#include <stdio.h>
#define in "buline.in"
#define out "buline.out"
#define dim 200001
#define maxim(a,b) a > b ? a : b
long long a[dim], s[dim], t[dim], k[dim];
long long b[dim], best[dim], nr[dim];
int n, smax, i, j;
int main()
{
int b,c;
int ip, is;
freopen(in,"r",stdin);
freopen(out,"w",stdout);
scanf("%d",&n);
for ( i = 1; i <= n; i++ )
{
scanf("%d%d",&b,&c);
if ( c == 1 ) a[i] = b;
else a[i] = -b;
}
// pentru normal
for ( i = 1; i <= n; i++ )
{
best[i] = a[i];
nr[i] = i;
if ( best[i] < a[i] + best[i-1] ) best[i] = a[i] + best[i-1], nr[i] = nr[i-1];
}
for ( i = 1; i <= n; i++ )
if ( smax < best[i] ) smax = best[i], ip = i, is = i-nr[i]+1;
// pentru circular
s[1] = a[1];
t[1] = a[1];
k[1] = 1;
for ( i = 2; i <= n; i++ )
{
s[i] = s[i-1] + a[i];
t[i] = maxim(t[i-1],s[i]);
if ( t[i-1] >= s[i] ) k[i] = k[i-1];
else k[i] = i;
}
for ( i = 2; i <= n; i++ )
{
if ( smax < t[i-1]+s[n]-s[i-1] )
{
smax = t[i-1]+s[n]-s[i-1];
ip = i;
if ( k[i] >= i ) is = k[i]-i;
else is = (n-i+1)+k[i];
}
}
printf("%d %d %d\n",smax,ip,is);
}