whitespace

Solution

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

int main(void)
{
	int state=0, *stack=NULL, N;

	scanf("%d", &N);
	stack=(int *)malloc(N*sizeof(int));
	while(getchar()!='\n');

	for(int i=0;i<N;i++)
	{
		char statement[15]={'\0', };
		fgets(statement,sizeof(statement),stdin);

		if(strncmp(statement,"push",4)==0)
		{
			int num=0;
			for(int j=5;statement[j]!='\0';j++)
				statement[j-5]=statement[j];
			num=atoi(statement);
			stack[state++]=num;
		}
		else if(strncmp(statement,"pop",3)==0)
			printf("%d\n", state==0?-1:stack[--state]);
		else if(strncmp(statement,"size",4)==0)
			printf("%d\n", state);
		else if(strncmp(statement,"empty",5)==0)
			printf("%d\n", state==0);
		else if(strncmp(statement,"top",3)==0)
			printf("%d\n", state==0?-1:stack[state-1]);
		else
			printf("error: %s", statement);
	}

	return 0;
}

Solution

#include<stdio.h>

int main(void)
{
	int N, sum=0, number;

	scanf("%d", &N);
	for(int i=0;i<N;i++)
	{
		scanf("%1d", &number);
		sum+=number;
	}

	printf("%d\n", sum);

	return 0;
}

Solution

#include<stdio.h>
#include<string.h>

int main(void)
{
	char word[1000000]={'\0', }, character;
	int N, alphabet[26]={0, }, pri=-1, sec=-1;

	fgets(word,sizeof(word),stdin);
	N=strlen(word);

	for(int i=0;i<N;i++)
		alphabet[word[i]>='a'?word[i]-'a':word[i]-'A']++;

	for(int i=0;i<26;i++)
		if(alphabet[i]>pri)
		{
			pri=alphabet[i];
			character='A'+i;
		}
		else if(alphabet[i]>sec)
			sec=alphabet[i];

	printf("%c\n", pri==sec?'?':character);

	return 0;
}

Solution

#include<stdio.h>
#include<string.h>

int main(void)
{
	int T;

	scanf("%d", &T);
	while(getchar()!='\n');

	for(int i=0;i<T;i++)
	{
		int score=0, con=1;
		char mark[80]={'\0', };

		gets(mark);
		for(int j=0;j<strlen(mark);j++)
			if(mark[j]=='O')
				score+=con++;
			else
				con=1;
		printf("%d\n", score);
	}

	return 0;
}

Solution

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

int main(void)
{
	int C;

	scanf("%d", &C);

	for(int i=0;i<C;i++)
	{
		int N, *score=NULL, count=0;
		float avr=0.0;

		scanf("%d", &N);
		score=(int *)malloc(N*sizeof(int));

		for(int j=0;j<N;j++)
		{
			scanf("%d", &score[j]);
			avr+=(float)score[j];
		}
		avr/=N;

		for(int j=0;j<N;j++)
			count+=score[j]>avr;

		printf("%.3f%%\n", (100.0*count)/N);
		free(score);
	}

	return 0;
}

Solution

#include<stdio.h>
#include<string.h>
#include<ctype.h>

int main(void)
{
	char str[1000001];
	int count=0;

	fgets(str,sizeof(str),stdin);

	for(int i=0;i<strlen(str);i++)
		if(i==0&&isalpha(str[i]))
			count++;
		else if(i==0)
			continue;
		else if(!isalpha(str[i-1])&&isalpha(str[i]))
			count++;

	printf("%d\n", count);
	return 0;
}

Solution

#include<stdio.h>

int main(void)
{
	int temp, mul=1, frequency[10]={0, };

	for(int i=0;i<3;i++)
	{
		scanf("%d", &temp);
		mul*=temp;
	}

	while(mul>0)
	{
		frequency[mul%10]++;
		mul/=10;
	}

	for(int i=0;i<10;i++)
		printf("%d\n", frequency[i]);

	return 0;
}

Solution

#include<stdio.h>

int main(void)
{
	int A, B, V;

	scanf("%d %d %d", &A, &B, &V);

	printf("%d\n", V<A?1:(V-A)%(A-B)==0?(V-A)/(A-B)+1:(V-A)/(A-B)+2);

	return 0;
}