Reversals

input/code.cpp: In function 'int main()':
input/code.cpp:18:40: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%i %i", &word_length, &queries);
                                        ^
input/code.cpp:22:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s", word);
                   ^
input/code.cpp:25:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%i %i", &start, &end);
                               ^

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

void reverse_substring(char* start, char* end) {
	while(start < end) {
		char tmp = *start;
        *start++ = *end;
        *end-- = tmp;
	}
}

int main()
{
	int word_length, queries, i, start, end;
	char* word;

	scanf("%i %i", &word_length, &queries);

	word = (char*)malloc(word_length);

	scanf("%s", word);

	for(i = 0; i < queries; i++){
		scanf("%i %i", &start, &end);
		start--; end--;
		reverse_substring(word + start, word + end);		
	}
	printf("%s\n",word);

	free(word);
	
	return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: TIME LIMIT EXCEEDED