Submission #10446685

---

Source Code Expand

#pragma GCC optimize ("Ofast")
#include <bits/stdc++.h>
#define FOR(i, a, b) for (int i=(a); i<(int)(b); i++)
#define FORD(i, a, b) for (int i=a; i>(int)(b); i--)
#define PPC(x) __builtin_popcount(x)
#define MSB(x) (31 - __builtin_clz(x))
#define pb push_back
#define ALL(x) (x).begin(), (x).end()
#define ithBit(m, i) ((m) >> (i) & 1)
#define ft first
#define sd second
#ifdef DEBUG
#include "debug.h"
#else
#define dbg(...) 0
#endif
using namespace std;

const int maxN = 1 << 19;

char T[maxN];
set <int> S[400];

void solve()
{
	int n, q;
	scanf ("%d%s%d", &n, T, &q);
	
	FOR(i, 0, n)
		S[T[i]].insert(i);
	FOR(i, 'a', 'z'+1)
		S[i].insert(n+1);
	
	while (q--)
	{
		int ev;
		scanf ("%d", &ev);
		if (ev == 1)
		{
			int i;
			char in[5];
			scanf ("%d%s", &i, in);
			i--;
			S[T[i]].erase(i);
			T[i] = in[0];
			S[T[i]].insert(i);
		}
		
		else
		{
			int a, b;
			scanf ("%d%d", &a, &b);
			a--, b--;
			int res = 0;
			FOR(c, 'a', 'z'+1)
				if (*(S[c].lower_bound(a)) <= b)
					res++;
			printf("%d\n", res);
		}
	}
} 
 
int main()
{
    int t;
    t = 1;//scanf ("%d", &t);
    while (t--)
    	solve();
    return 0;    
}

Submission Info

Compile Error

./Main.cpp: In function ‘void solve()’:
./Main.cpp:27:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf ("%d%s%d", &n, T, &q);
                             ^
./Main.cpp:37:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf ("%d", &ev);
                    ^
./Main.cpp:42:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
    scanf ("%d%s", &i, in);
                          ^
./Main.cpp:52:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
    scanf ("%d%d", &a, &b);
                          ^

Judge Result