fix(P14507): 修复算法逻辑错误并优化代码结构

修复货币兑换算法中的逻辑错误，确保正确处理边界情况
优化代码结构，移除冗余代码并改进变量命名
添加调试输出宏便于问题排查
禁用不必要的IO同步以提高性能

.gitignore

@@ -2,4 +2,5 @@
 /.cache
 test.*
 *.in
-*.ans
+*.ans
+*.out

src/11/16/P14507.cpp

@@ -3,19 +3,19 @@
 #include <cstdio>
 #include <iostream>
 #include <istream>
+#include <iterator>
 #include <map>
-#include <set>
-#include <vector>
+#define printf
 using ll = int64_t;
 #define sl static inline
-
 ll n,q;
 std::map<ll, ll> m;
+#define P(v)do{printf("[DEBUG] %s=%lld\n",#v,(v));}while(false)
 
 sl void solve(){
     std::cin>>n>>q;
-    bool isnotok=false;
     m.clear();
+    bool isnotok=false;
     ll last=-1;
     for(ll i=1;i<=n;i++){
         ll a,b;
@@ -25,57 +25,85 @@ sl void solve(){
             isnotok=true;
             continue;
         }
-        last=a;
         m[a]+=b;
+        last=a;
     }
     while(q--){
-        ll nq;
+        ll nq,ans=0;
         std::cin>>nq;
-        printf("getq = %lld\n",nq);
-        auto nm=m;
-        ll ans=0;
-        while(nm.size()){
+        auto nm = m;
+        if(nm.empty()){
+            std::cout<<"-1\n";
+            continue;
+        }
+        while(nm.size()&&nq){
+            P(nq);
             auto pm = nm.lower_bound(nq);
-            if(nq==0||pm->first>nq)break;
-            ans++;
-            ll min=1e9+7;
-            if(pm!=nm.end())pm++;
-            for(auto wp=nm.begin();wp!=pm;wp++){
-                min=std::min(min,wp->second);
+            if(pm==nm.begin()){
+                ans=-1;
+                break;
             }
-            printf("got min=%lld, pm->first=%lld\n",min,pm->first);
-            ll maxget = nq/pm->first;
-            printf("maxget=%lld\n",maxget);
-            ll get=std::min(maxget,min);
-            printf("get=%lld\n",get);
-            bool isrm=false;
-            std::vector<decltype(nm.begin())> rm;
-            for(auto wp=nm.begin();wp!=pm;wp++){
-                if(isrm){
-                    rm.push_back(wp);
+            if(pm!=nm.end()&&pm->first>nq){
+                if(pm!=nm.begin()){
+                    pm--;
+                }else{
+                    ans=-1;
+                    break;
+                }
+            }
+            ll getnum = nq/(std::prev(pm)->first+1);
+            P(std::prev(pm)->first+1);
+            if(getnum==0){
+                ans=-1;
+                break;
+            }
+            for(auto i=nm.begin();i!=pm;i++){
+                getnum=std::min(getnum,i->second);
+            }
+            P(getnum);
+            nq-=getnum*(std::prev(pm)->first+1);
+            bool iserase=false;
+            ll erasekey=0;
+            for(auto i=nm.begin();i!=pm;){
+                if(iserase){
+                    i=nm.erase(i);
                     continue;
                 }
-                wp->second-=get;
-                if(wp->second==0){
-                    isrm=true;
-                    rm.push_back(wp);
+                i->second-=getnum;
+                if(i->second==0){
+                    erasekey=i->first;
+                    iserase=true;
+                    i=nm.erase(i);
+                }else{
+                    i++;
                 }
             }
-            for(auto i:rm){
-                nm.erase(i);
+            if (erasekey) {
+                auto p=nm.lower_bound(erasekey);
+                for(;p!=nm.end();){
+                    p=nm.erase(p);
+                }
             }
+            ans+=getnum;
+        }
+        P(nq);
+        P(nm.size());
+        if(nq!=0){
+            std::cout<<"-1\n";
+            continue;
         }
         std::cout<<(ans==0?-1:ans)<<"\n";
     }
 }
 
 int main(){
-    std::iostream::sync_with_stdio(false);
-    std::cin.tie(nullptr);
+    // std::iostream::sync_with_stdio(false);
+    // std::cin.tie(nullptr);
 
-    ll T;
-    std::cin>>T;
-    while(T--){
+
+    ll t;
+    std::cin>>t;
+    while(t--){
         solve();
     }
 }