topcoder srm 553

div1 250pt:

　　题意：。。。

　　解法：先假设空出来的位置是0,然后模拟一次看看是不是满足，如果不行的话，我们只需要关心最后栈顶的元素取值是不是受空白处的影响，于是还是模拟一下。

 // BEGIN CUT HERE
 
 // END CUT HERE
 #line 5 "Suminator.cpp"
 #include<cstdio>
 #include<cstring>
 #include<cstdlib>
 #include<ctime>
 #include<cmath>
 #include<cassert>
 #include<iostream>
 #include<string>
 #include<sstream>
 #include<vector>
 #include<map>
 #include<set>
 #include<queue>
 #include<stack>
 #include<algorithm>
 using namespace std;
 typedef long long ll;
 typedef pair<int,int> pii;
 const int N = ;
 ll stk[N];
 class Suminator
 {
     public:
     int findMissing(vector <int> program, int wantedResult){
     //$CARETPOSITION$
         int top=;
         int n=program.size();
         for(int i=;i<n;i++){
             if(program[i] ==  || program[i] == -){
                 if(top >= ){
                     ll res = stk[top]+stk[top-];
                     stk[--top]=res;
             //        if(res > wantedResult)return -1;
                 }else if(top == ){
                     stk[++top] = ;
                 }
             }else{
                 stk[++top] = program[i];
             }
         }
         if(stk[top] == wantedResult)return ;
         bool have[N];memset(have,,sizeof(have));
         top = ;
         for(int i=;i<n;i++){
             if(program[i] == ){
                 if(top >= ){
                     ll res = stk[top] + stk[top-];
                     bool ok = have[top] || have[top-];
                     stk[--top] = res;
     //                if(res > wantedResult)return -1;
                     have[top] = ok;
                 }else if(top == ){
                     stk[++top] = ;
                     have[top] = ;
                 }
             }else if(program[i] == -){
                 stk[++top] = ;
                 have[top] = ;
             }else{
                 stk[++top] = program[i];
                 have[top] = ;
             }
         }
         if(have[top] == )return -;
         else if(stk[top] >= wantedResult)return -;
         else return wantedResult - stk[top];
 
     }
 
 // BEGIN CUT HERE
     public:
     void run_test(int Case) { if ((Case == -) || (Case == )) test_case_0(); if ((Case == -) || (Case == )) test_case_1(); if ((Case == -) || (Case == )) test_case_2(); if ((Case == -) || (Case == )) test_case_3(); if ((Case == -) || (Case == )) test_case_4(); if ((Case == -) || (Case == )) test_case_5(); }
     private:
     template <typename T> string print_array(const vector<T> &V) { ostringstream os; os << "{ "; for (typename vector<T>::const_iterator iter = V.begin(); iter != V.end(); ++iter) os << '\"' << *iter << "\","; os << " }"; return os.str(); }
     void verify_case(int Case, const int &Expected, const int &Received) { cerr << "Test Case #" << Case << "..."; if (Expected == Received) cerr << "PASSED" << endl; else { cerr << "FAILED" << endl; cerr << "\tExpected: \"" << Expected << '\"' << endl; cerr << "\tReceived: \"" << Received << '\"' << endl; } }
     void test_case_0() { int Arr0[] = {,-,}; vector <int> Arg0(Arr0, Arr0 + (sizeof(Arr0) / sizeof(Arr0[]))); int Arg1 = ; int Arg2 = ; verify_case(, Arg2, findMissing(Arg0, Arg1)); }
     void test_case_1() { int Arr0[] = {, , , , , -}; vector <int> Arg0(Arr0, Arr0 + (sizeof(Arr0) / sizeof(Arr0[]))); int Arg1 = ; int Arg2 = ; verify_case(, Arg2, findMissing(Arg0, Arg1)); }
     void test_case_2() { int Arr0[] = {-, , , , , , , }; vector <int> Arg0(Arr0, Arr0 + (sizeof(Arr0) / sizeof(Arr0[]))); int Arg1 = ; int Arg2 = ; verify_case(, Arg2, findMissing(Arg0, Arg1)); }
     void test_case_3() { int Arr0[] = {-, , , , , , , }; vector <int> Arg0(Arr0, Arr0 + (sizeof(Arr0) / sizeof(Arr0[]))); int Arg1 = ; int Arg2 = -; verify_case(, Arg2, findMissing(Arg0, Arg1)); }
     void test_case_4() { int Arr0[] = {, , ,  , -, , , , }; vector <int> Arg0(Arr0, Arr0 + (sizeof(Arr0) / sizeof(Arr0[]))); int Arg1 = ; int Arg2 = -; verify_case(, Arg2, findMissing(Arg0, Arg1)); }
     void test_case_5() { int Arr0[] = {, -, , }; vector <int> Arg0(Arr0, Arr0 + (sizeof(Arr0) / sizeof(Arr0[]))); int Arg1 = ; int Arg2 = -; verify_case(, Arg2, findMissing(Arg0, Arg1)); }
 
 // END CUT HERE
 
 };
 // BEGIN CUT HERE
 int main(){
     Suminator ___test;
     ___test.run_test(-);
     return ;
 }
 // END CUT HERE

250pt

div1 500pt

有点复杂的dp，有待实现