[vpr][route][crr] fix the problem with ranges::max_element

Author: amin1377

vpr/src/route/rr_graph_generation/rr_graph_area.cpp

@@ -290,10 +290,12 @@ static void count_bidir_routing_transistors(int num_switch, float R_minW_nmos, f
     /* Now add in the input connection block transistors. */
 
     // Get most frequent ipin switch
-    std::pair<RRSwitchId, size_t> most_frequent_ipin_switch_pair = std::ranges::max(ipin_switch_count,
-                                                                                    {},
-                                                                                    [](const auto& p) { return p.second; });
-    RRSwitchId most_frequent_ipin_switch = most_frequent_ipin_switch_pair.first;
+    auto most_frequent_ipin_switch_it = std::ranges::max_element(
+        ipin_switch_count,
+        [](const auto& a, const auto& b) noexcept { return a.second < b.second; }
+    );
+    VTR_ASSERT(most_frequent_ipin_switch_it != ipin_switch_count.end());
+    RRSwitchId most_frequent_ipin_switch = most_frequent_ipin_switch_it->first;
 
     input_cblock_trans = get_cblock_trans(num_inputs_to_cblock,
                                           most_frequent_ipin_switch,
@@ -490,10 +492,12 @@ static void count_unidir_routing_transistors(std::vector<t_segment_inf>& /*segme
     /* Now add in the input connection block transistors. */
 
     // Get most frequent ipin switch
-    std::pair<RRSwitchId, size_t> most_frequent_ipin_switch_pair = std::ranges::max(ipin_switch_count,
-                                                                                    {},
-                                                                                    [](const auto& p) { return p.second; });
-    RRSwitchId most_frequent_ipin_switch = most_frequent_ipin_switch_pair.first;
+    auto most_frequent_ipin_switch_it = std::ranges::max_element(
+        ipin_switch_count,
+        [](const auto& a, const auto& b) noexcept { return a.second < b.second; }
+    );
+    VTR_ASSERT(most_frequent_ipin_switch_it != ipin_switch_count.end());
+    RRSwitchId most_frequent_ipin_switch = most_frequent_ipin_switch_it->first;
 
     input_cblock_trans = get_cblock_trans(num_inputs_to_cblock,
                                           most_frequent_ipin_switch,