http://poj.org/problem?id=3115 #include <stdio.h> #include <math.h> #include <stdlib.h> #include <algorithm> using namespace std; int main( ) { __int64 m[4][2], *ans = m[0], *temp = m[1], *id = m[2], *idt = m[3], s1, s2, mem[2][20], *res = mem[0], *rest = mem[1]; int en[20], ti[20]; int f, p, e, a, i, j; while( 1 ) { scanf( "%d%d%d%d", &f, &p, &e, &a ); e *= a; if( f == 0 && p == 0 && e == 0 && a == 0 ) break; ans[0] = 0; ans[1] = 50000000000; id[0] = 0; id[1] = 1; for( j=0; j<f; j++ ) res[j] = 50000000000; for( i=0; i<p; i++ ) { for( j=0; j<f; j++ ) { scanf( "%d%d", en+j, ti+j ); en[j] *= ti[j]; } temp[0] = 50000000000; temp[1] = 50000000000; for( j=0; j<f; j++ ) { s1 = ans[0] + en[j] + e*(j!=id[0]); s2 = ans[1] + en[j] + e*(j!=id[1]); rest[j] = res[j] + en[j]; if( s1 < rest[j] ) rest[j] = s1; if( s2 < rest[j] ) rest[j] = s2; if( rest[j] < temp[0] ) { temp[1] = temp[0], idt[1] = idt[0]; temp[0] = rest[j], idt[0] = j; } else if( rest[j] < temp[1] ) temp[1] = rest[j], idt[1] = j; } swap( temp, ans ); swap( id, idt ); swap( rest, res ); } printf( "%I64dn", ans[0] ); } return 0; }
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