题解：P1089 [NOIP 2004 提高组] 津津的储蓄计划

#include <bits/stdc++.h>
#define Please return
#define AC 0
using namespace std;
#define rep(i, a, b) for (int i = a; i <= b; i++)
#define repr(i, a, b) for (int i = a; i >= b; i--)
int money = 0, x, y, cun;  
bool flag = true;

int main (void) {

	
	rep(i, 1, 12) {
		
        money += 300; 
        cin >> x;   
        money -= x;    
        
        if (money < 0) {   
		  
            flag = false;      
            cun = i;  
            break;          
        }
        y += money / 100;  
        money %= 100;      
		 
    }    
    if (flag) {
    	
        money += y * 120;   
        cout << money << endl;
    }            
    else cout << -cun << endl;   	
	Please AC;
}