Data commit

Task/100-prisoners/C/100-prisoners.c

@@ -0,0 +1,138 @@
+#include<stdbool.h>
+#include<stdlib.h>
+#include<stdio.h>
+#include<time.h>
+
+#define LIBERTY false
+#define DEATH true
+
+typedef struct{
+	int cardNum;
+	bool hasBeenOpened;
+}drawer;
+
+drawer *drawerSet;
+
+void initialize(int prisoners){
+	int i,j,card;
+	bool unique;
+
+	drawerSet = ((drawer*)malloc(prisoners * sizeof(drawer))) -1;
+
+	card = rand()%prisoners + 1;
+	drawerSet[1] = (drawer){.cardNum = card, .hasBeenOpened = false};
+
+	for(i=1 + 1;i<prisoners + 1;i++){
+		unique = false;
+		while(unique==false){
+			for(j=0;j<i;j++){
+				if(drawerSet[j].cardNum == card){
+					card = rand()%prisoners + 1;
+					break;
+				}
+			}
+			if(j==i){
+				unique = true;
+			}
+		}
+		drawerSet[i] = (drawer){.cardNum = card, .hasBeenOpened = false};
+	}
+
+}
+
+void closeAllDrawers(int prisoners){
+	int i;
+	for(i=1;i<prisoners + 1;i++)
+		drawerSet[i].hasBeenOpened = false;
+}
+
+bool libertyOrDeathAtRandom(int prisoners,int chances){
+	int i,j,chosenDrawer;
+
+	for(i= 1;i<prisoners + 1;i++){
+		bool foundCard = false;
+		for(j=0;j<chances;j++){
+			do{
+				chosenDrawer = rand()%prisoners + 1;
+			}while(drawerSet[chosenDrawer].hasBeenOpened==true);
+			if(drawerSet[chosenDrawer].cardNum == i){
+				foundCard = true;
+				break;
+			}
+			drawerSet[chosenDrawer].hasBeenOpened = true;
+		}
+		closeAllDrawers(prisoners);
+		if(foundCard == false)
+			return DEATH;
+	}
+
+	return LIBERTY;
+}
+
+bool libertyOrDeathPlanned(int prisoners,int chances){
+	int i,j,chosenDrawer;
+	for(i=1;i<prisoners + 1;i++){
+		chosenDrawer = i;
+		bool foundCard = false;
+		for(j=0;j<chances;j++){
+			drawerSet[chosenDrawer].hasBeenOpened = true;
+
+			if(drawerSet[chosenDrawer].cardNum == i){
+				foundCard = true;
+				break;
+			}
+			if(chosenDrawer == drawerSet[chosenDrawer].cardNum){
+				do{
+                    chosenDrawer = rand()%prisoners + 1;
+				}while(drawerSet[chosenDrawer].hasBeenOpened==true);
+			}
+			else{
+				chosenDrawer = drawerSet[chosenDrawer].cardNum;
+			}
+
+		}
+
+		closeAllDrawers(prisoners);
+		if(foundCard == false)
+			return DEATH;
+	}
+
+	return LIBERTY;
+}
+
+int main(int argc,char** argv)
+{
+	int prisoners, chances;
+	unsigned long long int trials,i,count = 0;
+        char* end;
+
+	if(argc!=4)
+		return printf("Usage : %s <Number of prisoners> <Number of chances> <Number of trials>",argv[0]);
+
+	prisoners = atoi(argv[1]);
+	chances = atoi(argv[2]);
+	trials = strtoull(argv[3],&end,10);
+
+	srand(time(NULL));
+
+	printf("Running random trials...");
+	for(i=0;i<trials;i+=1L){
+		initialize(prisoners);
+
+		count += libertyOrDeathAtRandom(prisoners,chances)==DEATH?0:1;
+	}
+
+	printf("\n\nGames Played : %llu\nGames Won : %llu\nChances : %lf %% \n\n",trials,count,(100.0*count)/trials);
+
+        count = 0;
+
+	printf("Running strategic trials...");
+	for(i=0;i<trials;i+=1L){
+		initialize(prisoners);
+
+		count += libertyOrDeathPlanned(prisoners,chances)==DEATH?0:1;
+	}
+
+	printf("\n\nGames Played : %llu\nGames Won : %llu\nChances : %lf %% \n\n",trials,count,(100.0*count)/trials);
+	return 0;
+}