added canCompleteCircuit

CMakeLists.txt

@@ -17,3 +17,4 @@ add_subdirectory(jump)
 add_subdirectory(hindex)
 add_subdirectory(randomizedset)
 add_subdirectory(productExceptSelf)
+add_subdirectory(canCompleteCircuit)

Makefile

@@ -1,4 +1,4 @@
-SUBDIRS := canJump jump majorityelement maxprofit maxprofit2 rmdupfromsortedarray rmdupfromsortedarray2 rotate twopointers hindex randomizedset productExceptSelf
+SUBDIRS := canJump jump majorityelement maxprofit maxprofit2 rmdupfromsortedarray rmdupfromsortedarray2 rotate twopointers hindex randomizedset productExceptSelf canCompleteCircuit
 
 all: $(SUBDIRS)
 

canCompleteCircuit/CMakeLists.txt

@@ -0,0 +1,6 @@
+FILE(GLOB_RECURSE SOURCES src/*.cpp)
+
+add_executable(
+    canCompleteCircuit
+    ${SOURCES}
+)

canCompleteCircuit/Makefile

@@ -0,0 +1,17 @@
+CXX = g++
+CFLAGS = -Wall -g -std=c++20
+SRCS = $(wildcard src/*/*.cpp src/*.cpp)
+OBJS = $(SRCS:.cpp=.o)
+TARGET = canCompleteCircuit
+CROSS_COMPILE =
+
+all: $(TARGET)
+
+$(TARGET): $(OBJS)
+	$(CROSS_COMPILE)$(CXX) $(LDFLAGS) $^ -o $@ $(LIBS)
+
+%.o: %.cpp
+	$(CROSS_COMPILE)$(CXX) $(CFLAGS) $(INCLUDES) -c $< -o $@
+
+clean:
+	rm -f $(OBJS) $(TARGET)

canCompleteCircuit/meson.build

@@ -0,0 +1 @@
+executable('canCompleteCircuit', 'src/main.cpp', install: true)

canCompleteCircuit/src/canCompleteCircuit.hpp

@@ -0,0 +1,16 @@
+#include <vector>
+
+inline int canCompleteCircuit(std::vector<int> &gas, std::vector<int> &cost) {
+  int total_tank = 0;
+  int curr_tank = 0;
+  int start = 0;
+  for (int i = 0; i < int(gas.size()); i++) {
+    total_tank += gas[i] - cost[i];
+    curr_tank += gas[i] - cost[i];
+    if (curr_tank < 0) {
+      start = i + 1;
+      curr_tank = 0;
+    }
+  }
+  return total_tank >= 0 ? start : -1;
+}

canCompleteCircuit/src/main.cpp

@@ -0,0 +1,16 @@
+#include <cassert>
+#include <vector>
+#include "canCompleteCircuit.hpp"
+
+int main() {
+  std::vector<int> gas = {1, 2, 3, 4, 5};
+  std::vector<int> cost = {3, 4, 5, 1, 2};
+  int output = canCompleteCircuit(gas, cost);
+  assert(output == 3);
+
+  gas = {2, 3, 4};
+  cost = {3, 4, 3};
+  output = canCompleteCircuit(gas, cost);
+  assert(output == -1);
+  return 0;
+}

meson.build

@@ -11,3 +11,4 @@ subdir('jump')
 subdir('hindex')
 subdir('randomizedset')
 subdir('productExceptSelf')
+subdir('canCompleteCircuit')