luogu P3952 时间复杂度 模拟

题目链接

luogu P3952 时间复杂度

题解

直接模拟即可
注意不要直接return
我真是naive
......

代码

#include<map> 
#include<stack> 
#include<cstdio> 
#include<cstring> 
#include<algorithm> 
#define rep(a,b,c) for(int a = b;a <= c;++ a) 
#define gc getchar()
#define pc putchar
inline int read() { 
    int x = 0,f = 1; 
    char c = gc; 
    while(c < '0' || c > '9') { if(c == '-') f =- 1;c = gc;}  
    while(c <= '9' && c >= '0') x = x * 10 + c - '0',c = gc; 
    return x * f; 
} 
void print(int x) { 
    if(x < 0) { 
        pc('-'); 
        x = -x; 
    } 
    if(x >= 10) print(x / 10); 
    pc(x % 10 + '0'); 
} 
char s[10007]; 
#define len(x) strlen(x + 1) 
std::map<char,bool>mp; 
std::stack<char>stk; 
std::map<char,bool> cant; 
std::map<char,bool> isnot; 
void solve() {
    int L = read(); 
    int l; 
    scanf("%s",s + 1); 
    l = len(s); 
    int ben = 0; 
    bool fs = false; 
    rep(i,1,l) { 
        if(s[i] == 'n') fs = true; 
        if(s[i] <= '9' && s[i] >= '0') ben = ben * 10 + s[i] - '0'; 
    } 
    int belnow = 0,bel = 0; 
    int flag = 0; 
    bool QAQ = false; 
    while(L --) { 
        scanf("%s",s + 1); 
        if(s[1] == 'F') { 
            int now = 0,nowto = 0; 
            char t,p = '%'; 
            rep(T,1,3) { 
                if(T == 1) { 
                    scanf("%s",s + 1); 
                    if(mp[s[1]]) { 
                        //puts("ERR"); 
                        QAQ = true; 
                        //continue; 
                    } 
                    mp[s[1]] = 1; 
                    t = s[1]; 
                    stk.push(s[1]); 
                } 
                if(T == 2) { 
                    scanf("%s",s + 1); 
                    if(s[1] < '0' || s[1] > '9') { 
                        p = s[1]; 
                        continue; 
                    } 
                    l = len(s); 
                    rep(i,1,l) 
                        if(s[i] <= '9' && s[i] >= '0') now = now * 10 + s[i] - '0'; 
                } 
                if(T == 3) { 
                    scanf("%s",s + 1); 
                    l = len(s); 
                    if(l == 1 && (s[1] > '9' || s[1] < '0')) { 
                        if(s[1] == p) continue; 
                        belnow ++; 
                        if(!flag) bel = std::max(bel,belnow); 	
                    } else {  
                        isnot[t] = 1; 
                        rep(i,1,l) 
                        if(s[i] <= '9' && s[i] >= '0') nowto = nowto * 10 + s[i] - '0'; 
                        if(now > nowto || p != '%') { 
                            flag  ++; 
                            cant[t] = 1; 
                        } 
                    } 
                } 
            } 
            
        } else {  
            if(!stk.size()) { 
                QAQ = true; 
                continue; 
             } 
            //if(QAQ) continue; 
            if(cant[stk.top()]) flag --; 
            if(!isnot[stk.top()]) belnow --; 
            isnot[stk.top()] = 0; 
            cant[stk.top()] = 0; 
            mp[stk.top()] = 0; 
            if(stk.size()) stk.pop(); 
        } 
    } 
    if(QAQ || stk.size()) { 
        puts("ERR"); 
        return ; 
    } 
    if(!fs) { 
        puts(bel == 0 ? "Yes" : "No"); 
    } 
    else puts(bel == ben ? "Yes" : "No"); 
} 
int main() { 
    int T = read(); 
    while(T --) { 
        mp.clear(); 
        isnot.clear(); 
        cant.clear(); 
        while(stk.size()) stk.pop(); 
        solve(); 
    } 
    return 0; 
}